diff --git a/libs/gui/DisplayEventReceiver.cpp b/libs/gui/DisplayEventReceiver.cpp
index f5cf1c4..b8faa2d 100644
--- a/libs/gui/DisplayEventReceiver.cpp
+++ b/libs/gui/DisplayEventReceiver.cpp
@@ -32,10 +32,11 @@
 
 // ---------------------------------------------------------------------------
 
-DisplayEventReceiver::DisplayEventReceiver(ISurfaceComposer::VsyncSource vsyncSource) {
+DisplayEventReceiver::DisplayEventReceiver(ISurfaceComposer::VsyncSource vsyncSource,
+                                           ISurfaceComposer::ConfigChanged configChanged) {
     sp<ISurfaceComposer> sf(ComposerService::getComposerService());
     if (sf != nullptr) {
-        mEventConnection = sf->createDisplayEventConnection(vsyncSource);
+        mEventConnection = sf->createDisplayEventConnection(vsyncSource, configChanged);
         if (mEventConnection != nullptr) {
             mDataChannel = std::make_unique<gui::BitTube>();
             mEventConnection->stealReceiveChannel(mDataChannel.get());
diff --git a/libs/gui/ISurfaceComposer.cpp b/libs/gui/ISurfaceComposer.cpp
index 6c9d81a..e487792 100644
--- a/libs/gui/ISurfaceComposer.cpp
+++ b/libs/gui/ISurfaceComposer.cpp
@@ -278,8 +278,8 @@
         return NO_ERROR;
     }
 
-    virtual sp<IDisplayEventConnection> createDisplayEventConnection(VsyncSource vsyncSource)
-    {
+    virtual sp<IDisplayEventConnection> createDisplayEventConnection(VsyncSource vsyncSource,
+                                                                     ConfigChanged configChanged) {
         Parcel data, reply;
         sp<IDisplayEventConnection> result;
         int err = data.writeInterfaceToken(
@@ -288,6 +288,7 @@
             return result;
         }
         data.writeInt32(static_cast<int32_t>(vsyncSource));
+        data.writeInt32(static_cast<int32_t>(configChanged));
         err = remote()->transact(
                 BnSurfaceComposer::CREATE_DISPLAY_EVENT_CONNECTION,
                 data, &reply);
@@ -1155,8 +1156,11 @@
         }
         case CREATE_DISPLAY_EVENT_CONNECTION: {
             CHECK_INTERFACE(ISurfaceComposer, data, reply);
-            sp<IDisplayEventConnection> connection(createDisplayEventConnection(
-                    static_cast<ISurfaceComposer::VsyncSource>(data.readInt32())));
+            auto vsyncSource = static_cast<ISurfaceComposer::VsyncSource>(data.readInt32());
+            auto configChanged = static_cast<ISurfaceComposer::ConfigChanged>(data.readInt32());
+
+            sp<IDisplayEventConnection> connection(
+                    createDisplayEventConnection(vsyncSource, configChanged));
             reply->writeStrongBinder(IInterface::asBinder(connection));
             return NO_ERROR;
         }
diff --git a/libs/gui/include/gui/DisplayEventReceiver.h b/libs/gui/include/gui/DisplayEventReceiver.h
index 22de751..a558cf9 100644
--- a/libs/gui/include/gui/DisplayEventReceiver.h
+++ b/libs/gui/include/gui/DisplayEventReceiver.h
@@ -88,10 +88,13 @@
      * DisplayEventReceiver creates and registers an event connection with
      * SurfaceFlinger. VSync events are disabled by default. Call setVSyncRate
      * or requestNextVsync to receive them.
+     * To receive Config Changed events specify this in the constructor.
      * Other events start being delivered immediately.
      */
     explicit DisplayEventReceiver(
-            ISurfaceComposer::VsyncSource vsyncSource = ISurfaceComposer::eVsyncSourceApp);
+            ISurfaceComposer::VsyncSource vsyncSource = ISurfaceComposer::eVsyncSourceApp,
+            ISurfaceComposer::ConfigChanged configChanged =
+                    ISurfaceComposer::eConfigChangedSuppress);
 
     /*
      * ~DisplayEventReceiver severs the connection with SurfaceFlinger, new events
diff --git a/libs/gui/include/gui/ISurfaceComposer.h b/libs/gui/include/gui/ISurfaceComposer.h
index e2f7736..c84910b 100644
--- a/libs/gui/include/gui/ISurfaceComposer.h
+++ b/libs/gui/include/gui/ISurfaceComposer.h
@@ -90,6 +90,8 @@
         eVsyncSourceSurfaceFlinger = 1
     };
 
+    enum ConfigChanged { eConfigChangedSuppress = 0, eConfigChangedDispatch = 1 };
+
     /*
      * Create a connection with SurfaceFlinger.
      */
@@ -97,7 +99,8 @@
 
     /* return an IDisplayEventConnection */
     virtual sp<IDisplayEventConnection> createDisplayEventConnection(
-            VsyncSource vsyncSource = eVsyncSourceApp) = 0;
+            VsyncSource vsyncSource = eVsyncSourceApp,
+            ConfigChanged configChanged = eConfigChangedSuppress) = 0;
 
     /* create a virtual display
      * requires ACCESS_SURFACE_FLINGER permission.
diff --git a/libs/gui/tests/Surface_test.cpp b/libs/gui/tests/Surface_test.cpp
index 960cf18..d370858 100644
--- a/libs/gui/tests/Surface_test.cpp
+++ b/libs/gui/tests/Surface_test.cpp
@@ -548,8 +548,8 @@
     }
 
     sp<ISurfaceComposerClient> createConnection() override { return nullptr; }
-    sp<IDisplayEventConnection> createDisplayEventConnection(ISurfaceComposer::VsyncSource)
-            override {
+    sp<IDisplayEventConnection> createDisplayEventConnection(
+            ISurfaceComposer::VsyncSource, ISurfaceComposer::ConfigChanged) override {
         return nullptr;
     }
     sp<IBinder> createDisplay(const String8& /*displayName*/,
diff --git a/services/inputflinger/InputClassifier.cpp b/services/inputflinger/InputClassifier.cpp
index ef1a224..6a7f279 100644
--- a/services/inputflinger/InputClassifier.cpp
+++ b/services/inputflinger/InputClassifier.cpp
@@ -82,7 +82,7 @@
 // Check if the "deep touch" feature is on.
 static bool deepPressEnabled() {
     std::string flag_value = server_configurable_flags::GetServerConfigurableFlag(
-            INPUT_NATIVE_BOOT, DEEP_PRESS_ENABLED, "true");
+            INPUT_NATIVE_BOOT, DEEP_PRESS_ENABLED, "false");
     std::transform(flag_value.begin(), flag_value.end(), flag_value.begin(), ::tolower);
     if (flag_value == "1" || flag_value == "true") {
         ALOGI("Deep press feature enabled.");
diff --git a/services/surfaceflinger/BufferQueueLayer.cpp b/services/surfaceflinger/BufferQueueLayer.cpp
index bd0b55f..d685366 100644
--- a/services/surfaceflinger/BufferQueueLayer.cpp
+++ b/services/surfaceflinger/BufferQueueLayer.cpp
@@ -143,7 +143,7 @@
     }
 
     Mutex::Autolock lock(mQueueItemLock);
-    return mQueueItems[0].mTimestamp <= mFlinger->mScheduler->expectedPresentTime();
+    return mQueueItems[0].mTimestamp <= mFlinger->getExpectedPresentTime();
 }
 
 nsecs_t BufferQueueLayer::getDesiredPresentTime() {
@@ -201,7 +201,7 @@
     uint64_t frameNumber = mQueueItems[0].mFrameNumber;
 
     // The head of the queue will be dropped if there are signaled and timely frames behind it
-    nsecs_t expectedPresentTime = mFlinger->mScheduler->expectedPresentTime();
+    nsecs_t expectedPresentTime = mFlinger->getExpectedPresentTime();
 
     if (isRemovedFromCurrentState()) {
         expectedPresentTime = 0;
@@ -279,7 +279,7 @@
                     getProducerStickyTransform() != 0, mName.string(), mOverrideScalingMode,
                     getTransformToDisplayInverse(), mFreezeGeometryUpdates);
 
-    nsecs_t expectedPresentTime = mFlinger->mScheduler->expectedPresentTime();
+    nsecs_t expectedPresentTime = mFlinger->getExpectedPresentTime();
 
     if (isRemovedFromCurrentState()) {
         expectedPresentTime = 0;
diff --git a/services/surfaceflinger/BufferStateLayer.cpp b/services/surfaceflinger/BufferStateLayer.cpp
index 05c721f..2abc1a7 100644
--- a/services/surfaceflinger/BufferStateLayer.cpp
+++ b/services/surfaceflinger/BufferStateLayer.cpp
@@ -50,12 +50,6 @@
     mOverrideScalingMode = NATIVE_WINDOW_SCALING_MODE_SCALE_TO_WINDOW;
     mCurrentState.dataspace = ui::Dataspace::V0_SRGB;
 }
-BufferStateLayer::~BufferStateLayer() {
-    if (mActiveBuffer != nullptr) {
-        auto& engine(mFlinger->getRenderEngine());
-        engine.unbindExternalTextureBuffer(mActiveBuffer->getId());
-    }
-}
 
 // -----------------------------------------------------------------------
 // Interface implementation for Layer
@@ -380,7 +374,7 @@
         return true;
     }
 
-    return mDesiredPresentTime <= mFlinger->mScheduler->expectedPresentTime();
+    return mDesiredPresentTime <= mFlinger->getExpectedPresentTime();
 }
 
 nsecs_t BufferStateLayer::getDesiredPresentTime() {
@@ -571,11 +565,6 @@
         return BAD_VALUE;
     }
 
-    if (mActiveBuffer != nullptr) {
-        // todo: get this to work with BufferStateLayerCache
-        auto& engine(mFlinger->getRenderEngine());
-        engine.unbindExternalTextureBuffer(mActiveBuffer->getId());
-    }
     mActiveBuffer = s.buffer;
     mActiveBufferFence = s.acquireFence;
     auto& layerCompositionState = getCompositionLayer()->editState().frontEnd;
@@ -621,6 +610,10 @@
     }
 }
 
+void BufferStateLayer::bufferErased(const client_cache_t& clientCacheId) {
+    mFlinger->getRenderEngine().unbindExternalTextureBuffer(clientCacheId.id);
+}
+
 void BufferStateLayer::HwcSlotGenerator::bufferErased(const client_cache_t& clientCacheId) {
     std::lock_guard lock(mMutex);
     if (!clientCacheId.isValid()) {
diff --git a/services/surfaceflinger/BufferStateLayer.h b/services/surfaceflinger/BufferStateLayer.h
index 4e2bc45..db8ae0d 100644
--- a/services/surfaceflinger/BufferStateLayer.h
+++ b/services/surfaceflinger/BufferStateLayer.h
@@ -34,7 +34,6 @@
 class BufferStateLayer : public BufferLayer {
 public:
     explicit BufferStateLayer(const LayerCreationArgs&);
-    ~BufferStateLayer() override;
 
     // -----------------------------------------------------------------------
     // Interface implementation for Layer
@@ -103,6 +102,9 @@
     bool fenceHasSignaled() const override;
     bool framePresentTimeIsCurrent() const override;
 
+    // Inherit from ClientCache::ErasedRecipient
+    void bufferErased(const client_cache_t& clientCacheId) override;
+
 private:
     nsecs_t getDesiredPresentTime() override;
     std::shared_ptr<FenceTime> getCurrentFenceTime() const override;
diff --git a/services/surfaceflinger/DisplayHardware/ComposerHal.cpp b/services/surfaceflinger/DisplayHardware/ComposerHal.cpp
index cc5a5b5..7f47a2e 100644
--- a/services/surfaceflinger/DisplayHardware/ComposerHal.cpp
+++ b/services/surfaceflinger/DisplayHardware/ComposerHal.cpp
@@ -24,6 +24,7 @@
 
 #include <composer-command-buffer/2.2/ComposerCommandBuffer.h>
 #include <gui/BufferQueue.h>
+#include <hidl/HidlTransportSupport.h>
 #include <hidl/HidlTransportUtils.h>
 
 namespace android {
@@ -229,6 +230,7 @@
 
 void Composer::registerCallback(const sp<IComposerCallback>& callback)
 {
+    android::hardware::setMinSchedulerPolicy(callback, SCHED_FIFO, 2);
     auto ret = mClient->registerCallback(callback);
     if (!ret.isOk()) {
         ALOGE("failed to register IComposerCallback");
diff --git a/services/surfaceflinger/Layer.h b/services/surfaceflinger/Layer.h
index 5c55111..6db6beb 100644
--- a/services/surfaceflinger/Layer.h
+++ b/services/surfaceflinger/Layer.h
@@ -17,8 +17,6 @@
 #ifndef ANDROID_LAYER_H
 #define ANDROID_LAYER_H
 
-#include <sys/types.h>
-
 #include <compositionengine/LayerFE.h>
 #include <gui/BufferQueue.h>
 #include <gui/ISurfaceComposerClient.h>
@@ -28,6 +26,7 @@
 #include <math/vec4.h>
 #include <renderengine/Mesh.h>
 #include <renderengine/Texture.h>
+#include <sys/types.h>
 #include <ui/FloatRect.h>
 #include <ui/FrameStats.h>
 #include <ui/GraphicBuffer.h>
@@ -44,16 +43,16 @@
 #include <vector>
 
 #include "Client.h"
+#include "ClientCache.h"
+#include "DisplayHardware/ComposerHal.h"
+#include "DisplayHardware/HWComposer.h"
 #include "FrameTracker.h"
 #include "LayerVector.h"
 #include "MonitoredProducer.h"
+#include "RenderArea.h"
 #include "SurfaceFlinger.h"
 #include "TransactionCompletedThread.h"
 
-#include "DisplayHardware/ComposerHal.h"
-#include "DisplayHardware/HWComposer.h"
-#include "RenderArea.h"
-
 using namespace android::surfaceflinger;
 
 namespace android {
@@ -94,7 +93,7 @@
     LayerMetadata metadata;
 };
 
-class Layer : public virtual compositionengine::LayerFE {
+class Layer : public virtual compositionengine::LayerFE, public ClientCache::ErasedRecipient {
     static std::atomic<int32_t> sSequence;
 
 public:
@@ -701,6 +700,9 @@
     compositionengine::OutputLayer* findOutputLayerForDisplay(
             const sp<const DisplayDevice>& display) const;
 
+    // Inherit from ClientCache::ErasedRecipient
+    void bufferErased(const client_cache_t& /*clientCacheId*/) override {}
+
 protected:
     // constant
     sp<SurfaceFlinger> mFlinger;
diff --git a/services/surfaceflinger/Scheduler/DispSync.cpp b/services/surfaceflinger/Scheduler/DispSync.cpp
index cd6fa41..e59d459 100644
--- a/services/surfaceflinger/Scheduler/DispSync.cpp
+++ b/services/surfaceflinger/Scheduler/DispSync.cpp
@@ -79,11 +79,7 @@
         Mutex::Autolock lock(mMutex);
 
         mPhase = phase;
-        if (mReferenceTime != referenceTime) {
-            for (auto& eventListener : mEventListeners) {
-                eventListener.mHasFired = false;
-            }
-        }
+        const bool referenceTimeChanged = mReferenceTime != referenceTime;
         mReferenceTime = referenceTime;
         if (mPeriod != 0 && mPeriod != period && mReferenceTime != 0) {
             // Inflate the reference time to be the most recent predicted
@@ -94,6 +90,12 @@
             mReferenceTime = mReferenceTime + (numOldPeriods)*mPeriod;
         }
         mPeriod = period;
+        if (!mModelLocked && referenceTimeChanged) {
+            for (auto& eventListener : mEventListeners) {
+                eventListener.mLastEventTime =
+                        mReferenceTime - mPeriod + mPhase + eventListener.mPhase;
+            }
+        }
         if (mTraceDetailedInfo) {
             ATRACE_INT64("DispSync:Period", mPeriod);
             ATRACE_INT64("DispSync:Phase", mPhase + mPeriod / 2);
@@ -115,11 +117,13 @@
     void lockModel() {
         Mutex::Autolock lock(mMutex);
         mModelLocked = true;
+        ATRACE_INT("DispSync:ModelLocked", mModelLocked);
     }
 
     void unlockModel() {
         Mutex::Autolock lock(mMutex);
         mModelLocked = false;
+        ATRACE_INT("DispSync:ModelLocked", mModelLocked);
     }
 
     virtual bool threadLoop() {
@@ -289,7 +293,14 @@
                 } else if (diff < -mPeriod / 2) {
                     diff += mPeriod;
                 }
+
+                if (phase < 0 && oldPhase > 0) {
+                    diff += mPeriod;
+                } else if (phase > 0 && oldPhase < 0) {
+                    diff -= mPeriod;
+                }
                 eventListener.mLastEventTime -= diff;
+                eventListener.mLastCallbackTime -= diff;
                 mCond.signal();
                 return NO_ERROR;
             }
@@ -304,7 +315,6 @@
         nsecs_t mLastEventTime;
         nsecs_t mLastCallbackTime;
         DispSync::Callback* mCallback;
-        bool mHasFired = false;
     };
 
     struct CallbackInvocation {
@@ -352,12 +362,7 @@
                           eventListener.mName);
                     continue;
                 }
-                if (eventListener.mHasFired && !mModelLocked) {
-                    eventListener.mLastEventTime = t;
-                    ALOGV("[%s] [%s] Skipping event due to already firing", mName,
-                          eventListener.mName);
-                    continue;
-                }
+
                 CallbackInvocation ci;
                 ci.mCallback = eventListener.mCallback;
                 ci.mEventTime = t;
@@ -366,7 +371,6 @@
                 callbackInvocations.push_back(ci);
                 eventListener.mLastEventTime = t;
                 eventListener.mLastCallbackTime = now;
-                eventListener.mHasFired = true;
             }
         }
 
@@ -493,7 +497,6 @@
         ALOGE("Couldn't set SCHED_FIFO for DispSyncThread");
     }
 
-    reset();
     beginResync();
 
     if (mTraceDetailedInfo && kEnableZeroPhaseTracer) {
@@ -545,17 +548,15 @@
 void DispSync::beginResync() {
     Mutex::Autolock lock(mMutex);
     ALOGV("[%s] beginResync", mName);
-    mThread->unlockModel();
-    mModelUpdated = false;
-    mNumResyncSamples = 0;
+    resetLocked();
 }
 
-bool DispSync::addResyncSample(nsecs_t timestamp, bool* periodChanged) {
+bool DispSync::addResyncSample(nsecs_t timestamp, bool* periodFlushed) {
     Mutex::Autolock lock(mMutex);
 
     ALOGV("[%s] addResyncSample(%" PRId64 ")", mName, ns2us(timestamp));
 
-    *periodChanged = false;
+    *periodFlushed = false;
     const size_t idx = (mFirstResyncSample + mNumResyncSamples) % MAX_RESYNC_SAMPLES;
     mResyncSamples[idx] = timestamp;
     if (mNumResyncSamples == 0) {
@@ -569,16 +570,20 @@
         const nsecs_t lastTimestamp = mResyncSamples[priorIdx];
 
         const nsecs_t observedVsync = std::abs(timestamp - lastTimestamp);
-        if (std::abs(observedVsync - mPendingPeriod) < std::abs(observedVsync - mPeriod)) {
-            // Observed vsync is closer to the pending period, so reset the
-            // model and flush the pending period.
+        if (std::abs(observedVsync - mPendingPeriod) <= std::abs(observedVsync - mIntendedPeriod)) {
+            // Either the observed vsync is closer to the pending period, (and
+            // thus we detected a period change), or the period change will
+            // no-op. In either case, reset the model and flush the pending
+            // period.
             resetLocked();
+            mIntendedPeriod = mPendingPeriod;
             mPeriod = mPendingPeriod;
             mPendingPeriod = 0;
             if (mTraceDetailedInfo) {
                 ATRACE_INT("DispSync:PendingPeriod", mPendingPeriod);
+                ATRACE_INT("DispSync:IntendedPeriod", mIntendedPeriod);
             }
-            *periodChanged = true;
+            *periodFlushed = true;
         }
     }
     // Always update the reference time with the most recent timestamp.
@@ -609,6 +614,7 @@
     bool modelLocked = mModelUpdated && mError < (kErrorThreshold / 2) && mPendingPeriod == 0;
     ALOGV("[%s] addResyncSample returning %s", mName, modelLocked ? "locked" : "unlocked");
     if (modelLocked) {
+        *periodFlushed = true;
         mThread->lockModel();
     }
     return !modelLocked;
@@ -643,10 +649,17 @@
 
 void DispSync::setPeriod(nsecs_t period) {
     Mutex::Autolock lock(mMutex);
-    if (mTraceDetailedInfo) {
-        ATRACE_INT("DispSync:PendingPeriod", period);
+
+    const bool pendingPeriodShouldChange =
+            period != mIntendedPeriod || (period == mIntendedPeriod && mPendingPeriod != 0);
+
+    if (pendingPeriodShouldChange) {
+        mPendingPeriod = period;
     }
-    mPendingPeriod = period;
+    if (mTraceDetailedInfo) {
+        ATRACE_INT("DispSync:IntendedPeriod", mIntendedPeriod);
+        ATRACE_INT("DispSync:PendingPeriod", mPendingPeriod);
+    }
 }
 
 nsecs_t DispSync::getPeriod() {
@@ -764,6 +777,9 @@
     mPresentSampleOffset = 0;
     mError = 0;
     mZeroErrSamplesCount = 0;
+    if (mTraceDetailedInfo) {
+        ATRACE_INT64("DispSync:Error", mError);
+    }
     for (size_t i = 0; i < NUM_PRESENT_SAMPLES; i++) {
         mPresentFences[i] = FenceTime::NO_FENCE;
     }
diff --git a/services/surfaceflinger/Scheduler/DispSync.h b/services/surfaceflinger/Scheduler/DispSync.h
index 8f8b8e7..3e33c7e 100644
--- a/services/surfaceflinger/Scheduler/DispSync.h
+++ b/services/surfaceflinger/Scheduler/DispSync.h
@@ -49,7 +49,7 @@
     virtual void reset() = 0;
     virtual bool addPresentFence(const std::shared_ptr<FenceTime>&) = 0;
     virtual void beginResync() = 0;
-    virtual bool addResyncSample(nsecs_t timestamp, bool* periodChanged) = 0;
+    virtual bool addResyncSample(nsecs_t timestamp, bool* periodFlushed) = 0;
     virtual void endResync() = 0;
     virtual void setPeriod(nsecs_t period) = 0;
     virtual nsecs_t getPeriod() = 0;
@@ -120,17 +120,19 @@
     // from the hardware vsync events.
     void beginResync() override;
     // Adds a vsync sample to the dispsync model. The timestamp is the time
-    // of the vsync event that fired. periodChanged will return true if the
+    // of the vsync event that fired. periodFlushed will return true if the
     // vsync period was detected to have changed to mPendingPeriod.
     //
     // This method will return true if more vsync samples are needed to lock
     // down the DispSync model, and false otherwise.
-    bool addResyncSample(nsecs_t timestamp, bool* periodChanged) override;
+    // periodFlushed will be set to true if mPendingPeriod is flushed to
+    // mIntendedPeriod, and false otherwise.
+    bool addResyncSample(nsecs_t timestamp, bool* periodFlushed) override;
     void endResync() override;
 
     // The setPeriod method sets the vsync event model's period to a specific
-    // value.  This should be used to prime the model when a display is first
-    // turned on.  It should NOT be used after that.
+    // value. This should be used to prime the model when a display is first
+    // turned on, or when a refresh rate change is requested.
     void setPeriod(nsecs_t period) override;
 
     // The getPeriod method returns the current vsync period.
@@ -205,6 +207,11 @@
     // nanoseconds.
     nsecs_t mPeriod;
 
+    // mIntendedPeriod is the intended period of the modeled vsync events in
+    // nanoseconds. Under ideal conditions this should be similar if not the
+    // same as mPeriod, plus or minus an observed error.
+    nsecs_t mIntendedPeriod = 0;
+
     // mPendingPeriod is the proposed period change in nanoseconds.
     // If mPendingPeriod differs from mPeriod and is nonzero, it will
     // be flushed to mPeriod when we detect that the hardware switched
@@ -236,8 +243,8 @@
     // process to store information about the hardware vsync event times used
     // to compute the model.
     nsecs_t mResyncSamples[MAX_RESYNC_SAMPLES] = {0};
-    size_t mFirstResyncSample;
-    size_t mNumResyncSamples;
+    size_t mFirstResyncSample = 0;
+    size_t mNumResyncSamples = 0;
     int mNumResyncSamplesSincePresent;
 
     // These member variables store information about the present fences used
diff --git a/services/surfaceflinger/Scheduler/DispSyncSource.cpp b/services/surfaceflinger/Scheduler/DispSyncSource.cpp
index 00948ae..265b8aa 100644
--- a/services/surfaceflinger/Scheduler/DispSyncSource.cpp
+++ b/services/surfaceflinger/Scheduler/DispSyncSource.cpp
@@ -27,14 +27,16 @@
 
 namespace android {
 
-DispSyncSource::DispSyncSource(DispSync* dispSync, nsecs_t phaseOffset, bool traceVsync,
+DispSyncSource::DispSyncSource(DispSync* dispSync, nsecs_t phaseOffset,
+                               nsecs_t offsetThresholdForNextVsync, bool traceVsync,
                                const char* name)
       : mName(name),
         mTraceVsync(traceVsync),
         mVsyncOnLabel(base::StringPrintf("VsyncOn-%s", name)),
         mVsyncEventLabel(base::StringPrintf("VSYNC-%s", name)),
         mDispSync(dispSync),
-        mPhaseOffset(phaseOffset) {}
+        mPhaseOffset(phaseOffset),
+        mOffsetThresholdForNextVsync(offsetThresholdForNextVsync) {}
 
 void DispSyncSource::setVSyncEnabled(bool enable) {
     std::lock_guard lock(mVsyncMutex);
@@ -64,15 +66,15 @@
 
 void DispSyncSource::setPhaseOffset(nsecs_t phaseOffset) {
     std::lock_guard lock(mVsyncMutex);
-
-    // Normalize phaseOffset to [0, period)
-    auto period = mDispSync->getPeriod();
-    phaseOffset %= period;
-    if (phaseOffset < 0) {
-        // If we're here, then phaseOffset is in (-period, 0). After this
-        // operation, it will be in (0, period)
-        phaseOffset += period;
+    const nsecs_t period = mDispSync->getPeriod();
+    // Check if offset should be handled as negative
+    if (phaseOffset >= mOffsetThresholdForNextVsync) {
+        phaseOffset -= period;
     }
+
+    // Normalize phaseOffset to [-period, period)
+    const int numPeriods = phaseOffset / period;
+    phaseOffset -= numPeriods * period;
     mPhaseOffset = phaseOffset;
 
     // If we're not enabled, we don't need to mess with the listeners
diff --git a/services/surfaceflinger/Scheduler/DispSyncSource.h b/services/surfaceflinger/Scheduler/DispSyncSource.h
index 4759699..b6785c5 100644
--- a/services/surfaceflinger/Scheduler/DispSyncSource.h
+++ b/services/surfaceflinger/Scheduler/DispSyncSource.h
@@ -25,7 +25,8 @@
 
 class DispSyncSource final : public VSyncSource, private DispSync::Callback {
 public:
-    DispSyncSource(DispSync* dispSync, nsecs_t phaseOffset, bool traceVsync, const char* name);
+    DispSyncSource(DispSync* dispSync, nsecs_t phaseOffset, nsecs_t offsetThresholdForNextVsync,
+                   bool traceVsync, const char* name);
 
     ~DispSyncSource() override = default;
 
@@ -53,6 +54,7 @@
 
     std::mutex mVsyncMutex;
     nsecs_t mPhaseOffset GUARDED_BY(mVsyncMutex);
+    const nsecs_t mOffsetThresholdForNextVsync;
     bool mEnabled GUARDED_BY(mVsyncMutex) = false;
 };
 
diff --git a/services/surfaceflinger/Scheduler/EventThread.cpp b/services/surfaceflinger/Scheduler/EventThread.cpp
index 05bad4d..9d1f777 100644
--- a/services/surfaceflinger/Scheduler/EventThread.cpp
+++ b/services/surfaceflinger/Scheduler/EventThread.cpp
@@ -76,6 +76,10 @@
             return StringPrintf("VSync{displayId=%" ANDROID_PHYSICAL_DISPLAY_ID_FORMAT
                                 ", count=%u}",
                                 event.header.displayId, event.vsync.count);
+        case DisplayEventReceiver::DISPLAY_EVENT_CONFIG_CHANGED:
+            return StringPrintf("ConfigChanged{displayId=%" ANDROID_PHYSICAL_DISPLAY_ID_FORMAT
+                                ", configId=%u}",
+                                event.header.displayId, event.config.configId);
         default:
             return "Event{}";
     }
@@ -107,8 +111,10 @@
 } // namespace
 
 EventThreadConnection::EventThreadConnection(EventThread* eventThread,
-                                             ResyncCallback resyncCallback)
+                                             ResyncCallback resyncCallback,
+                                             ISurfaceComposer::ConfigChanged configChanged)
       : resyncCallback(std::move(resyncCallback)),
+        configChanged(configChanged),
         mEventThread(eventThread),
         mChannel(gui::BitTube::DefaultSize) {}
 
@@ -203,8 +209,10 @@
     mVSyncSource->setPhaseOffset(phaseOffset);
 }
 
-sp<EventThreadConnection> EventThread::createEventConnection(ResyncCallback resyncCallback) const {
-    return new EventThreadConnection(const_cast<EventThread*>(this), std::move(resyncCallback));
+sp<EventThreadConnection> EventThread::createEventConnection(
+        ResyncCallback resyncCallback, ISurfaceComposer::ConfigChanged configChanged) const {
+    return new EventThreadConnection(const_cast<EventThread*>(this), std::move(resyncCallback),
+                                     configChanged);
 }
 
 status_t EventThread::registerDisplayEventConnection(const sp<EventThreadConnection>& connection) {
@@ -398,9 +406,11 @@
                                      const sp<EventThreadConnection>& connection) const {
     switch (event.header.type) {
         case DisplayEventReceiver::DISPLAY_EVENT_HOTPLUG:
-        case DisplayEventReceiver::DISPLAY_EVENT_CONFIG_CHANGED:
             return true;
 
+        case DisplayEventReceiver::DISPLAY_EVENT_CONFIG_CHANGED:
+            return connection->configChanged == ISurfaceComposer::eConfigChangedDispatch;
+
         case DisplayEventReceiver::DISPLAY_EVENT_VSYNC:
             switch (connection->vsyncRequest) {
                 case VSyncRequest::None:
diff --git a/services/surfaceflinger/Scheduler/EventThread.h b/services/surfaceflinger/Scheduler/EventThread.h
index 61530c6..dd23b88 100644
--- a/services/surfaceflinger/Scheduler/EventThread.h
+++ b/services/surfaceflinger/Scheduler/EventThread.h
@@ -69,7 +69,8 @@
 
 class EventThreadConnection : public BnDisplayEventConnection {
 public:
-    EventThreadConnection(EventThread*, ResyncCallback);
+    EventThreadConnection(EventThread*, ResyncCallback,
+                          ISurfaceComposer::ConfigChanged configChanged);
     virtual ~EventThreadConnection();
 
     virtual status_t postEvent(const DisplayEventReceiver::Event& event);
@@ -82,6 +83,7 @@
     const ResyncCallback resyncCallback;
 
     VSyncRequest vsyncRequest = VSyncRequest::None;
+    const ISurfaceComposer::ConfigChanged configChanged;
 
 private:
     virtual void onFirstRef();
@@ -93,7 +95,8 @@
 public:
     virtual ~EventThread();
 
-    virtual sp<EventThreadConnection> createEventConnection(ResyncCallback) const = 0;
+    virtual sp<EventThreadConnection> createEventConnection(
+            ResyncCallback, ISurfaceComposer::ConfigChanged configChanged) const = 0;
 
     // called before the screen is turned off from main thread
     virtual void onScreenReleased() = 0;
@@ -128,7 +131,8 @@
     EventThread(std::unique_ptr<VSyncSource>, InterceptVSyncsCallback, const char* threadName);
     ~EventThread();
 
-    sp<EventThreadConnection> createEventConnection(ResyncCallback) const override;
+    sp<EventThreadConnection> createEventConnection(
+            ResyncCallback, ISurfaceComposer::ConfigChanged configChanged) const override;
 
     status_t registerDisplayEventConnection(const sp<EventThreadConnection>& connection) override;
     void setVsyncRate(uint32_t rate, const sp<EventThreadConnection>& connection) override;
diff --git a/services/surfaceflinger/Scheduler/LayerHistory.cpp b/services/surfaceflinger/Scheduler/LayerHistory.cpp
index 1db43a3..e762af3 100644
--- a/services/surfaceflinger/Scheduler/LayerHistory.cpp
+++ b/services/surfaceflinger/Scheduler/LayerHistory.cpp
@@ -173,5 +173,18 @@
     }
 }
 
+void LayerHistory::clearHistory() {
+    std::lock_guard lock(mLock);
+
+    auto it = mActiveLayerInfos.begin();
+    while (it != mActiveLayerInfos.end()) {
+        auto id = it->first;
+        auto layerInfo = it->second;
+        layerInfo->clearHistory();
+        mInactiveLayerInfos.insert({id, layerInfo});
+        it = mActiveLayerInfos.erase(it);
+    }
+}
+
 } // namespace scheduler
 } // namespace android
\ No newline at end of file
diff --git a/services/surfaceflinger/Scheduler/LayerHistory.h b/services/surfaceflinger/Scheduler/LayerHistory.h
index adc5ce5..2569b46 100644
--- a/services/surfaceflinger/Scheduler/LayerHistory.h
+++ b/services/surfaceflinger/Scheduler/LayerHistory.h
@@ -64,6 +64,9 @@
     // layers. See go/content-fps-detection-in-scheduler for more information.
     std::pair<float, bool> getDesiredRefreshRateAndHDR();
 
+    // Clears all layer history.
+    void clearHistory();
+
     // Removes the handle and the object from the map.
     void destroyLayer(const int64_t id);
 
diff --git a/services/surfaceflinger/Scheduler/MessageQueue.cpp b/services/surfaceflinger/Scheduler/MessageQueue.cpp
index baf900d..fcb307f 100644
--- a/services/surfaceflinger/Scheduler/MessageQueue.cpp
+++ b/services/surfaceflinger/Scheduler/MessageQueue.cpp
@@ -96,7 +96,8 @@
     }
 
     mEventThread = eventThread;
-    mEvents = eventThread->createEventConnection(std::move(resyncCallback));
+    mEvents = eventThread->createEventConnection(std::move(resyncCallback),
+                                                 ISurfaceComposer::eConfigChangedSuppress);
     mEvents->stealReceiveChannel(&mEventTube);
     mLooper->addFd(mEventTube.getFd(), 0, Looper::EVENT_INPUT, MessageQueue::cb_eventReceiver,
                    this);
diff --git a/services/surfaceflinger/Scheduler/Scheduler.cpp b/services/surfaceflinger/Scheduler/Scheduler.cpp
index 513436a..bb24f73 100644
--- a/services/surfaceflinger/Scheduler/Scheduler.cpp
+++ b/services/surfaceflinger/Scheduler/Scheduler.cpp
@@ -119,17 +119,19 @@
 }
 
 sp<Scheduler::ConnectionHandle> Scheduler::createConnection(
-        const char* connectionName, int64_t phaseOffsetNs, ResyncCallback resyncCallback,
+        const char* connectionName, nsecs_t phaseOffsetNs, nsecs_t offsetThresholdForNextVsync,
+        ResyncCallback resyncCallback,
         impl::EventThread::InterceptVSyncsCallback interceptCallback) {
     const int64_t id = sNextId++;
     ALOGV("Creating a connection handle with ID: %" PRId64 "\n", id);
 
     std::unique_ptr<EventThread> eventThread =
             makeEventThread(connectionName, mPrimaryDispSync.get(), phaseOffsetNs,
-                            std::move(interceptCallback));
+                            offsetThresholdForNextVsync, std::move(interceptCallback));
 
     auto eventThreadConnection =
-            createConnectionInternal(eventThread.get(), std::move(resyncCallback));
+            createConnectionInternal(eventThread.get(), std::move(resyncCallback),
+                                     ISurfaceComposer::eConfigChangedSuppress);
     mConnections.emplace(id,
                          std::make_unique<Connection>(new ConnectionHandle(id),
                                                       eventThreadConnection,
@@ -138,24 +140,28 @@
 }
 
 std::unique_ptr<EventThread> Scheduler::makeEventThread(
-        const char* connectionName, DispSync* dispSync, int64_t phaseOffsetNs,
+        const char* connectionName, DispSync* dispSync, nsecs_t phaseOffsetNs,
+        nsecs_t offsetThresholdForNextVsync,
         impl::EventThread::InterceptVSyncsCallback interceptCallback) {
     std::unique_ptr<VSyncSource> eventThreadSource =
-            std::make_unique<DispSyncSource>(dispSync, phaseOffsetNs, true, connectionName);
+            std::make_unique<DispSyncSource>(dispSync, phaseOffsetNs, offsetThresholdForNextVsync,
+                                             true, connectionName);
     return std::make_unique<impl::EventThread>(std::move(eventThreadSource),
                                                std::move(interceptCallback), connectionName);
 }
 
-sp<EventThreadConnection> Scheduler::createConnectionInternal(EventThread* eventThread,
-                                                              ResyncCallback&& resyncCallback) {
-    return eventThread->createEventConnection(std::move(resyncCallback));
+sp<EventThreadConnection> Scheduler::createConnectionInternal(
+        EventThread* eventThread, ResyncCallback&& resyncCallback,
+        ISurfaceComposer::ConfigChanged configChanged) {
+    return eventThread->createEventConnection(std::move(resyncCallback), configChanged);
 }
 
 sp<IDisplayEventConnection> Scheduler::createDisplayEventConnection(
-        const sp<Scheduler::ConnectionHandle>& handle, ResyncCallback resyncCallback) {
+        const sp<Scheduler::ConnectionHandle>& handle, ResyncCallback resyncCallback,
+        ISurfaceComposer::ConfigChanged configChanged) {
     RETURN_VALUE_IF_INVALID(nullptr);
     return createConnectionInternal(mConnections[handle->id]->thread.get(),
-                                    std::move(resyncCallback));
+                                    std::move(resyncCallback), configChanged);
 }
 
 EventThread* Scheduler::getEventThread(const sp<Scheduler::ConnectionHandle>& handle) {
@@ -280,13 +286,13 @@
     }
 }
 
-void Scheduler::addResyncSample(const nsecs_t timestamp, bool* periodChanged) {
+void Scheduler::addResyncSample(const nsecs_t timestamp, bool* periodFlushed) {
     bool needsHwVsync = false;
-    *periodChanged = false;
+    *periodFlushed = false;
     { // Scope for the lock
         std::lock_guard<std::mutex> lock(mHWVsyncLock);
         if (mPrimaryHWVsyncEnabled) {
-            needsHwVsync = mPrimaryDispSync->addResyncSample(timestamp, periodChanged);
+            needsHwVsync = mPrimaryDispSync->addResyncSample(timestamp, periodFlushed);
         }
     }
 
@@ -309,7 +315,7 @@
     mPrimaryDispSync->setIgnorePresentFences(ignore);
 }
 
-nsecs_t Scheduler::expectedPresentTime() {
+nsecs_t Scheduler::getDispSyncExpectedPresentTime() {
     return mPrimaryDispSync->expectedPresentTime();
 }
 
@@ -404,6 +410,10 @@
     if (mSupportKernelTimer) {
         resetIdleTimer();
     }
+
+    // Touch event will boost the refresh rate to performance.
+    // Clear Layer History to get fresh FPS detection
+    mLayerHistory.clearHistory();
 }
 
 void Scheduler::resetTimerCallback() {
@@ -415,7 +425,7 @@
     ATRACE_INT("ExpiredKernelIdleTimer", 0);
     std::lock_guard<std::mutex> lock(mCallbackLock);
     if (mGetVsyncPeriod) {
-        resyncToHardwareVsync(false, mGetVsyncPeriod());
+        resyncToHardwareVsync(true, mGetVsyncPeriod());
     }
 }
 
diff --git a/services/surfaceflinger/Scheduler/Scheduler.h b/services/surfaceflinger/Scheduler/Scheduler.h
index 96d4bd5..eaad37c 100644
--- a/services/surfaceflinger/Scheduler/Scheduler.h
+++ b/services/surfaceflinger/Scheduler/Scheduler.h
@@ -96,12 +96,13 @@
     virtual ~Scheduler();
 
     /** Creates an EventThread connection. */
-    sp<ConnectionHandle> createConnection(const char* connectionName, int64_t phaseOffsetNs,
-                                          ResyncCallback,
+    sp<ConnectionHandle> createConnection(const char* connectionName, nsecs_t phaseOffsetNs,
+                                          nsecs_t offsetThresholdForNextVsync, ResyncCallback,
                                           impl::EventThread::InterceptVSyncsCallback);
 
-    sp<IDisplayEventConnection> createDisplayEventConnection(const sp<ConnectionHandle>& handle,
-                                                             ResyncCallback);
+    sp<IDisplayEventConnection> createDisplayEventConnection(
+            const sp<ConnectionHandle>& handle, ResyncCallback,
+            ISurfaceComposer::ConfigChanged configChanged);
 
     // Getter methods.
     EventThread* getEventThread(const sp<ConnectionHandle>& handle);
@@ -135,16 +136,21 @@
 
     void enableHardwareVsync();
     void disableHardwareVsync(bool makeUnavailable);
+    // Resyncs the scheduler to hardware vsync.
+    // If makeAvailable is true, then hardware vsync will be turned on.
+    // Otherwise, if hardware vsync is not already enabled then this method will
+    // no-op.
+    // The period is the vsync period from the current display configuration.
     void resyncToHardwareVsync(bool makeAvailable, nsecs_t period);
     // Creates a callback for resyncing.
     ResyncCallback makeResyncCallback(GetVsyncPeriod&& getVsyncPeriod);
     void setRefreshSkipCount(int count);
-    // Passes a vsync sample to DispSync. periodChange will be true if DipSync
-    // detected that the vsync period changed, and false otherwise.
-    void addResyncSample(const nsecs_t timestamp, bool* periodChanged);
+    // Passes a vsync sample to DispSync. periodFlushed will be true if
+    // DispSync detected that the vsync period changed, and false otherwise.
+    void addResyncSample(const nsecs_t timestamp, bool* periodFlushed);
     void addPresentFence(const std::shared_ptr<FenceTime>& fenceTime);
     void setIgnorePresentFences(bool ignore);
-    nsecs_t expectedPresentTime();
+    nsecs_t getDispSyncExpectedPresentTime();
     // Registers the layer in the scheduler, and returns the handle for future references.
     std::unique_ptr<scheduler::LayerHistory::LayerHandle> registerLayer(std::string const& name,
                                                                         int windowType);
@@ -179,7 +185,8 @@
 
 protected:
     virtual std::unique_ptr<EventThread> makeEventThread(
-            const char* connectionName, DispSync* dispSync, int64_t phaseOffsetNs,
+            const char* connectionName, DispSync* dispSync, nsecs_t phaseOffsetNs,
+            nsecs_t offsetThresholdForNextVsync,
             impl::EventThread::InterceptVSyncsCallback interceptCallback);
 
 private:
@@ -192,7 +199,8 @@
     enum class TouchState { INACTIVE, ACTIVE };
 
     // Creates a connection on the given EventThread and forwards the given callbacks.
-    sp<EventThreadConnection> createConnectionInternal(EventThread*, ResyncCallback&&);
+    sp<EventThreadConnection> createConnectionInternal(EventThread*, ResyncCallback&&,
+                                                       ISurfaceComposer::ConfigChanged);
 
     nsecs_t calculateAverage() const;
     void updateFrameSkipping(const int64_t skipCount);
@@ -292,7 +300,7 @@
     const scheduler::RefreshRateConfigs& mRefreshRateConfigs;
 
     // Global config to force HDR content to work on DEFAULT refreshRate
-    static constexpr bool mForceHDRContentToDefaultRefreshRate = true;
+    static constexpr bool mForceHDRContentToDefaultRefreshRate = false;
 };
 
 } // namespace android
diff --git a/services/surfaceflinger/Scheduler/VSyncModulator.h b/services/surfaceflinger/Scheduler/VSyncModulator.h
index 81a7864..73a1fb9 100644
--- a/services/surfaceflinger/Scheduler/VSyncModulator.h
+++ b/services/surfaceflinger/Scheduler/VSyncModulator.h
@@ -35,6 +35,11 @@
     // sending new transactions.
     const int MIN_EARLY_FRAME_COUNT_TRANSACTION = 2;
 
+    // Number of frames we'll keep the early gl phase offsets once they are activated.
+    // This acts as a low-pass filter to avoid scenarios where we rapidly
+    // switch in and out of gl composition.
+    const int MIN_EARLY_GL_FRAME_COUNT_TRANSACTION = 2;
+
 public:
     struct Offsets {
         nsecs_t sf;
@@ -51,10 +56,12 @@
     // appEarly: Like sfEarly, but for the app-vsync
     // appEarlyGl: Like sfEarlyGl, but for the app-vsync.
     // appLate: The regular app vsync phase offset.
-    void setPhaseOffsets(Offsets early, Offsets earlyGl, Offsets late) {
+    void setPhaseOffsets(Offsets early, Offsets earlyGl, Offsets late,
+                         nsecs_t thresholdForNextVsync) {
         mEarlyOffsets = early;
         mEarlyGlOffsets = earlyGl;
         mLateOffsets = late;
+        mThresholdForNextVsync = thresholdForNextVsync;
 
         if (mSfConnectionHandle && late.sf != mOffsets.load().sf) {
             mScheduler->setPhaseOffset(mSfConnectionHandle, late.sf);
@@ -116,7 +123,7 @@
 
     // Called when we detect from vsync signals that the refresh rate changed.
     // This way we can move out of early offsets if no longer necessary.
-    void onRefreshRateChangeDetected() {
+    void onRefreshRateChangeCompleted() {
         if (!mRefreshRateChangePending) {
             return;
         }
@@ -130,10 +137,14 @@
             mRemainingEarlyFrameCount--;
             updateOffsetsNeeded = true;
         }
-        if (usedRenderEngine != mLastFrameUsedRenderEngine) {
-            mLastFrameUsedRenderEngine = usedRenderEngine;
+        if (usedRenderEngine) {
+            mRemainingRenderEngineUsageCount = MIN_EARLY_GL_FRAME_COUNT_TRANSACTION;
+            updateOffsetsNeeded = true;
+        } else if (mRemainingRenderEngineUsageCount > 0) {
+            mRemainingRenderEngineUsageCount--;
             updateOffsetsNeeded = true;
         }
+
         if (updateOffsetsNeeded) {
             updateOffsets();
         }
@@ -145,7 +156,7 @@
         if (mTransactionStart == Scheduler::TransactionStart::EARLY ||
             mRemainingEarlyFrameCount > 0 || mRefreshRateChangePending) {
             return mEarlyOffsets;
-        } else if (mLastFrameUsedRenderEngine) {
+        } else if (mRemainingRenderEngineUsageCount > 0) {
             return mEarlyGlOffsets;
         } else {
             return mLateOffsets;
@@ -183,6 +194,7 @@
     Offsets mLateOffsets;
     Offsets mEarlyOffsets;
     Offsets mEarlyGlOffsets;
+    nsecs_t mThresholdForNextVsync;
 
     EventThread* mSfEventThread = nullptr;
     EventThread* mAppEventThread = nullptr;
@@ -195,9 +207,9 @@
 
     std::atomic<Scheduler::TransactionStart> mTransactionStart =
             Scheduler::TransactionStart::NORMAL;
-    std::atomic<bool> mLastFrameUsedRenderEngine = false;
     std::atomic<bool> mRefreshRateChangePending = false;
     std::atomic<int> mRemainingEarlyFrameCount = 0;
+    std::atomic<int> mRemainingRenderEngineUsageCount = 0;
 };
 
 } // namespace android
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index e795ba1..a96305e 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -377,7 +377,8 @@
     mLumaSampling = atoi(value);
 
     const auto [early, gl, late] = mPhaseOffsets->getCurrentOffsets();
-    mVsyncModulator.setPhaseOffsets(early, gl, late);
+    mVsyncModulator.setPhaseOffsets(early, gl, late,
+                                    mPhaseOffsets->getOffsetThresholdForNextVsync());
 
     // We should be reading 'persist.sys.sf.color_saturation' here
     // but since /data may be encrypted, we need to wait until after vold
@@ -616,13 +617,16 @@
             mScheduler->makeResyncCallback(std::bind(&SurfaceFlinger::getVsyncPeriod, this));
 
     mAppConnectionHandle =
-            mScheduler->createConnection("app", mPhaseOffsets->getCurrentAppOffset(),
+            mScheduler->createConnection("app", mVsyncModulator.getOffsets().app,
+                                         mPhaseOffsets->getOffsetThresholdForNextVsync(),
                                          resyncCallback,
                                          impl::EventThread::InterceptVSyncsCallback());
-    mSfConnectionHandle = mScheduler->createConnection("sf", mPhaseOffsets->getCurrentSfOffset(),
-                                                       resyncCallback, [this](nsecs_t timestamp) {
-                                                           mInterceptor->saveVSyncEvent(timestamp);
-                                                       });
+    mSfConnectionHandle =
+            mScheduler->createConnection("sf", mVsyncModulator.getOffsets().sf,
+                                         mPhaseOffsets->getOffsetThresholdForNextVsync(),
+                                         resyncCallback, [this](nsecs_t timestamp) {
+                                             mInterceptor->saveVSyncEvent(timestamp);
+                                         });
 
     mEventQueue->setEventConnection(mScheduler->getEventConnection(mSfConnectionHandle));
     mVsyncModulator.setSchedulerAndHandles(mScheduler.get(), mAppConnectionHandle.get(),
@@ -935,10 +939,13 @@
         // Start receiving vsync samples now, so that we can detect a period
         // switch.
         mScheduler->resyncToHardwareVsync(true, getVsyncPeriod());
+        // As we called to set period, we will call to onRefreshRateChangeCompleted once
+        // DispSync model is locked.
+        mVsyncModulator.onRefreshRateChangeInitiated();
         mPhaseOffsets->setRefreshRateType(info.type);
         const auto [early, gl, late] = mPhaseOffsets->getCurrentOffsets();
-        mVsyncModulator.onRefreshRateChangeInitiated();
-        mVsyncModulator.setPhaseOffsets(early, gl, late);
+        mVsyncModulator.setPhaseOffsets(early, gl, late,
+                                        mPhaseOffsets->getOffsetThresholdForNextVsync());
     }
     mDesiredActiveConfigChanged = true;
     ATRACE_INT("DesiredActiveConfigChanged", mDesiredActiveConfigChanged);
@@ -970,10 +977,10 @@
 
     display->setActiveConfig(mUpcomingActiveConfig.configId);
 
-    mScheduler->resyncToHardwareVsync(true, getVsyncPeriod());
     mPhaseOffsets->setRefreshRateType(mUpcomingActiveConfig.type);
     const auto [early, gl, late] = mPhaseOffsets->getCurrentOffsets();
-    mVsyncModulator.setPhaseOffsets(early, gl, late);
+    mVsyncModulator.setPhaseOffsets(early, gl, late,
+                                    mPhaseOffsets->getOffsetThresholdForNextVsync());
     ATRACE_INT("ActiveConfigMode", mUpcomingActiveConfig.configId);
 
     if (mUpcomingActiveConfig.event != Scheduler::ConfigEvent::None) {
@@ -982,6 +989,19 @@
     }
 }
 
+void SurfaceFlinger::desiredActiveConfigChangeDone() {
+    std::lock_guard<std::mutex> lock(mActiveConfigLock);
+    mDesiredActiveConfig.event = Scheduler::ConfigEvent::None;
+    mDesiredActiveConfigChanged = false;
+    ATRACE_INT("DesiredActiveConfigChanged", mDesiredActiveConfigChanged);
+
+    mScheduler->resyncToHardwareVsync(true, getVsyncPeriod());
+    mPhaseOffsets->setRefreshRateType(mUpcomingActiveConfig.type);
+    const auto [early, gl, late] = mPhaseOffsets->getCurrentOffsets();
+    mVsyncModulator.setPhaseOffsets(early, gl, late,
+                                    mPhaseOffsets->getOffsetThresholdForNextVsync());
+}
+
 bool SurfaceFlinger::performSetActiveConfig() {
     ATRACE_CALL();
     if (mCheckPendingFence) {
@@ -1011,10 +1031,7 @@
     if (!display || display->getActiveConfig() == desiredActiveConfig.configId) {
         // display is not valid or we are already in the requested mode
         // on both cases there is nothing left to do
-        std::lock_guard<std::mutex> lock(mActiveConfigLock);
-        mDesiredActiveConfig.event = Scheduler::ConfigEvent::None;
-        mDesiredActiveConfigChanged = false;
-        ATRACE_INT("DesiredActiveConfigChanged", mDesiredActiveConfigChanged);
+        desiredActiveConfigChangeDone();
         return false;
     }
 
@@ -1022,11 +1039,7 @@
     // allowed configs might have change by the time we process the refresh.
     // Make sure the desired config is still allowed
     if (!isDisplayConfigAllowed(desiredActiveConfig.configId)) {
-        std::lock_guard<std::mutex> lock(mActiveConfigLock);
-        mDesiredActiveConfig.event = Scheduler::ConfigEvent::None;
-        mDesiredActiveConfig.configId = display->getActiveConfig();
-        mDesiredActiveConfigChanged = false;
-        ATRACE_INT("DesiredActiveConfigChanged", mDesiredActiveConfigChanged);
+        desiredActiveConfigChangeDone();
         return false;
     }
     mUpcomingActiveConfig = desiredActiveConfig;
@@ -1366,7 +1379,7 @@
 // ----------------------------------------------------------------------------
 
 sp<IDisplayEventConnection> SurfaceFlinger::createDisplayEventConnection(
-        ISurfaceComposer::VsyncSource vsyncSource) {
+        ISurfaceComposer::VsyncSource vsyncSource, ISurfaceComposer::ConfigChanged configChanged) {
     auto resyncCallback = mScheduler->makeResyncCallback([this] {
         Mutex::Autolock lock(mStateLock);
         return getVsyncPeriod();
@@ -1375,7 +1388,8 @@
     const auto& handle =
             vsyncSource == eVsyncSourceSurfaceFlinger ? mSfConnectionHandle : mAppConnectionHandle;
 
-    return mScheduler->createDisplayEventConnection(handle, std::move(resyncCallback));
+    return mScheduler->createDisplayEventConnection(handle, std::move(resyncCallback),
+                                                    configChanged);
 }
 
 // ----------------------------------------------------------------------------
@@ -1448,10 +1462,10 @@
         return;
     }
 
-    bool periodChanged = false;
-    mScheduler->addResyncSample(timestamp, &periodChanged);
-    if (periodChanged) {
-        mVsyncModulator.onRefreshRateChangeDetected();
+    bool periodFlushed = false;
+    mScheduler->addResyncSample(timestamp, &periodFlushed);
+    if (periodFlushed) {
+        mVsyncModulator.onRefreshRateChangeCompleted();
     }
 }
 
@@ -1524,10 +1538,23 @@
 
 void SurfaceFlinger::setPrimaryVsyncEnabled(bool enabled) {
     ATRACE_CALL();
-    Mutex::Autolock lock(mStateLock);
+
+    // Enable / Disable HWVsync from the main thread to avoid race conditions with
+    // display power state.
+    postMessageAsync(new LambdaMessage(
+            [=]() NO_THREAD_SAFETY_ANALYSIS { setPrimaryVsyncEnabledInternal(enabled); }));
+}
+
+void SurfaceFlinger::setPrimaryVsyncEnabledInternal(bool enabled) {
+    ATRACE_CALL();
+
+    mHWCVsyncPendingState = enabled ? HWC2::Vsync::Enable : HWC2::Vsync::Disable;
+
     if (const auto displayId = getInternalDisplayIdLocked()) {
-        getHwComposer().setVsyncEnabled(*displayId,
-                                        enabled ? HWC2::Vsync::Enable : HWC2::Vsync::Disable);
+        sp<DisplayDevice> display = getDefaultDisplayDeviceLocked();
+        if (display && display->isPoweredOn()) {
+            setVsyncEnabledInHWC(*displayId, mHWCVsyncPendingState);
+        }
     }
 }
 
@@ -1637,6 +1664,18 @@
     return fence != Fence::NO_FENCE && (fence->getStatus() == Fence::Status::Unsignaled);
 }
 
+nsecs_t SurfaceFlinger::getExpectedPresentTime() NO_THREAD_SAFETY_ANALYSIS {
+    DisplayStatInfo stats;
+    mScheduler->getDisplayStatInfo(&stats);
+    const nsecs_t presentTime = mScheduler->getDispSyncExpectedPresentTime();
+    // Inflate the expected present time if we're targetting the next vsync.
+    const nsecs_t correctedTime =
+            mVsyncModulator.getOffsets().sf < mPhaseOffsets->getOffsetThresholdForNextVsync()
+            ? presentTime
+            : presentTime + stats.vsyncPeriod;
+    return correctedTime;
+}
+
 void SurfaceFlinger::onMessageReceived(int32_t what) NO_THREAD_SAFETY_ANALYSIS {
     ATRACE_CALL();
     switch (what) {
@@ -3245,8 +3284,7 @@
     mDrawingState.traverseInZOrder([&](Layer* layer) {
         if (layer->hasReadyFrame()) {
             frameQueued = true;
-            nsecs_t expectedPresentTime;
-            expectedPresentTime = mScheduler->expectedPresentTime();
+            const nsecs_t expectedPresentTime = getExpectedPresentTime();
             if (layer->shouldPresentNow(expectedPresentTime)) {
                 mLayersWithQueuedFrames.push_back(layer);
             } else {
@@ -3643,7 +3681,7 @@
 
 bool SurfaceFlinger::transactionIsReadyToBeApplied(int64_t desiredPresentTime,
                                                    const Vector<ComposerState>& states) {
-    nsecs_t expectedPresentTime = mScheduler->expectedPresentTime();
+    nsecs_t expectedPresentTime = getExpectedPresentTime();
     // Do not present if the desiredPresentTime has not passed unless it is more than one second
     // in the future. We ignore timestamps more than 1 second in the future for stability reasons.
     if (desiredPresentTime >= 0 && desiredPresentTime >= expectedPresentTime &&
@@ -4123,6 +4161,9 @@
     sp<GraphicBuffer> buffer;
     if (bufferChanged && cacheIdChanged) {
         ClientCache::getInstance().add(s.cachedBuffer, s.buffer);
+        ClientCache::getInstance().registerErasedRecipient(s.cachedBuffer,
+                                                           wp<ClientCache::ErasedRecipient>(layer));
+        getRenderEngine().cacheExternalTextureBuffer(s.buffer);
         buffer = s.buffer;
     } else if (cacheIdChanged) {
         buffer = ClientCache::getInstance().get(s.cachedBuffer);
@@ -4406,6 +4447,13 @@
             new LambdaMessage([this]() NO_THREAD_SAFETY_ANALYSIS { onInitializeDisplays(); }));
 }
 
+void SurfaceFlinger::setVsyncEnabledInHWC(DisplayId displayId, HWC2::Vsync enabled) {
+    if (mHWCVsyncState != enabled) {
+        getHwComposer().setVsyncEnabled(displayId, enabled);
+        mHWCVsyncState = enabled;
+    }
+}
+
 void SurfaceFlinger::setPowerModeInternal(const sp<DisplayDevice>& display, int mode) {
     if (display->isVirtual()) {
         ALOGE("%s: Invalid operation on virtual display", __FUNCTION__);
@@ -4432,6 +4480,7 @@
         // Turn on the display
         getHwComposer().setPowerMode(*displayId, mode);
         if (display->isPrimary() && mode != HWC_POWER_MODE_DOZE_SUSPEND) {
+            setVsyncEnabledInHWC(*displayId, mHWCVsyncPendingState);
             mScheduler->onScreenAcquired(mAppConnectionHandle);
             mScheduler->resyncToHardwareVsync(true, getVsyncPeriod());
         }
@@ -4457,6 +4506,9 @@
             mScheduler->onScreenReleased(mAppConnectionHandle);
         }
 
+        // Make sure HWVsync is disabled before turning off the display
+        setVsyncEnabledInHWC(*displayId, HWC2::Vsync::Disable);
+
         getHwComposer().setPowerMode(*displayId, mode);
         mVisibleRegionsDirty = true;
         // from this point on, SF will stop drawing on this display
diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index ddfe88c..6d4b2d7 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -293,11 +293,19 @@
     // TODO: this should be made accessible only to EventThread
     void setPrimaryVsyncEnabled(bool enabled);
 
+    // main thread function to enable/disable h/w composer event
+    void setPrimaryVsyncEnabledInternal(bool enabled);
+
     // called on the main thread by MessageQueue when an internal message
     // is received
     // TODO: this should be made accessible only to MessageQueue
     void onMessageReceived(int32_t what);
 
+    // Returns the expected present time for this frame.
+    // When we are in negative offsets, we perform a correction so that the
+    // predicted vsync for the *next* frame is used instead.
+    nsecs_t getExpectedPresentTime();
+
     // for debugging only
     // TODO: this should be made accessible only to HWComposer
     const Vector<sp<Layer>>& getLayerSortedByZForHwcDisplay(DisplayId displayId);
@@ -399,7 +407,9 @@
             const sp<IGraphicBufferProducer>& bufferProducer) const override;
     status_t getSupportedFrameTimestamps(std::vector<FrameEvent>* outSupported) const override;
     sp<IDisplayEventConnection> createDisplayEventConnection(
-            ISurfaceComposer::VsyncSource vsyncSource = eVsyncSourceApp) override;
+            ISurfaceComposer::VsyncSource vsyncSource = eVsyncSourceApp,
+            ISurfaceComposer::ConfigChanged configChanged =
+                    ISurfaceComposer::eConfigChangedSuppress) override;
     status_t captureScreen(const sp<IBinder>& displayToken, sp<GraphicBuffer>* outBuffer,
             bool& outCapturedSecureLayers, const ui::Dataspace reqDataspace,
             const ui::PixelFormat reqPixelFormat, Rect sourceCrop,
@@ -508,13 +518,15 @@
     // Sets the desired active config bit. It obtains the lock, and sets mDesiredActiveConfig.
     void setDesiredActiveConfig(const ActiveConfigInfo& info) REQUIRES(mStateLock);
     // Once HWC has returned the present fence, this sets the active config and a new refresh
-    // rate in SF. It also triggers HWC vsync.
+    // rate in SF.
     void setActiveConfigInternal() REQUIRES(mStateLock);
     // Active config is updated on INVALIDATE call in a state machine-like manner. When the
     // desired config was set, HWC needs to update the panel on the next refresh, and when
     // we receive the fence back, we know that the process was complete. It returns whether
     // we need to wait for the next invalidate
     bool performSetActiveConfig() REQUIRES(mStateLock);
+    // Called when active config is no longer is progress
+    void desiredActiveConfigChangeDone() REQUIRES(mStateLock);
     // called on the main thread in response to setPowerMode()
     void setPowerModeInternal(const sp<DisplayDevice>& display, int mode) REQUIRES(mStateLock);
 
@@ -833,6 +845,7 @@
     }
 
     bool previousFrameMissed();
+    void setVsyncEnabledInHWC(DisplayId displayId, HWC2::Vsync enabled);
 
     /*
      * Debugging & dumpsys
@@ -1166,6 +1179,10 @@
     // The Layer pointer is removed from the set when the destructor is called so there shouldn't
     // be any issues with a raw pointer referencing an invalid object.
     std::unordered_set<Layer*> mOffscreenLayers;
+
+    // Flags to capture the state of Vsync in HWC
+    HWC2::Vsync mHWCVsyncState = HWC2::Vsync::Disable;
+    HWC2::Vsync mHWCVsyncPendingState = HWC2::Vsync::Disable;
 };
 
 } // namespace android
diff --git a/services/surfaceflinger/tests/unittests/DispSyncSourceTest.cpp b/services/surfaceflinger/tests/unittests/DispSyncSourceTest.cpp
index 2e705da..0aa8cf5 100644
--- a/services/surfaceflinger/tests/unittests/DispSyncSourceTest.cpp
+++ b/services/surfaceflinger/tests/unittests/DispSyncSourceTest.cpp
@@ -51,6 +51,7 @@
     AsyncCallRecorder<void (*)(nsecs_t)> mVSyncEventCallRecorder;
 
     static constexpr std::chrono::nanoseconds mPhaseOffset = 6ms;
+    static constexpr std::chrono::nanoseconds mOffsetThresholdForNextVsync = 16ms;
     static constexpr int mIterations = 100;
 };
 
@@ -78,7 +79,8 @@
 
 void DispSyncSourceTest::createDispSyncSource() {
     createDispSync();
-    mDispSyncSource = std::make_unique<DispSyncSource>(mDispSync.get(), mPhaseOffset.count(), true,
+    mDispSyncSource = std::make_unique<DispSyncSource>(mDispSync.get(), mPhaseOffset.count(),
+                                                       mOffsetThresholdForNextVsync.count(), true,
                                                        "DispSyncSourceTest");
     mDispSyncSource->setCallback(this);
 }
diff --git a/services/surfaceflinger/tests/unittests/EventThreadTest.cpp b/services/surfaceflinger/tests/unittests/EventThreadTest.cpp
index ea908a9..dbd9b84 100644
--- a/services/surfaceflinger/tests/unittests/EventThreadTest.cpp
+++ b/services/surfaceflinger/tests/unittests/EventThreadTest.cpp
@@ -55,8 +55,9 @@
     class MockEventThreadConnection : public EventThreadConnection {
     public:
         MockEventThreadConnection(android::impl::EventThread* eventThread,
-                                  ResyncCallback&& resyncCallback)
-              : EventThreadConnection(eventThread, std::move(resyncCallback)) {}
+                                  ResyncCallback&& resyncCallback,
+                                  ISurfaceComposer::ConfigChanged configChanged)
+              : EventThreadConnection(eventThread, std::move(resyncCallback), configChanged) {}
         MOCK_METHOD1(postEvent, status_t(const DisplayEventReceiver::Event& event));
     };
 
@@ -67,7 +68,8 @@
     ~EventThreadTest() override;
 
     void createThread();
-    sp<MockEventThreadConnection> createConnection(ConnectionEventRecorder& recorder);
+    sp<MockEventThreadConnection> createConnection(ConnectionEventRecorder& recorder,
+                                                   ISurfaceComposer::ConfigChanged configChanged);
 
     void expectVSyncSetEnabledCallReceived(bool expectedState);
     void expectVSyncSetPhaseOffsetCallReceived(nsecs_t expectedPhaseOffset);
@@ -110,7 +112,8 @@
             .WillRepeatedly(Invoke(mVSyncSetPhaseOffsetCallRecorder.getInvocable()));
 
     createThread();
-    mConnection = createConnection(mConnectionEventCallRecorder);
+    mConnection = createConnection(mConnectionEventCallRecorder,
+                                   ISurfaceComposer::eConfigChangedDispatch);
 
     // A display must be connected for VSYNC events to be delivered.
     mThread->onHotplugReceived(INTERNAL_DISPLAY_ID, true);
@@ -138,9 +141,10 @@
 }
 
 sp<EventThreadTest::MockEventThreadConnection> EventThreadTest::createConnection(
-        ConnectionEventRecorder& recorder) {
+        ConnectionEventRecorder& recorder, ISurfaceComposer::ConfigChanged configChanged) {
     sp<MockEventThreadConnection> connection =
-            new MockEventThreadConnection(mThread.get(), mResyncCallRecorder.getInvocable());
+            new MockEventThreadConnection(mThread.get(), mResyncCallRecorder.getInvocable(),
+                                          configChanged);
     EXPECT_CALL(*connection, postEvent(_)).WillRepeatedly(Invoke(recorder.getInvocable()));
     return connection;
 }
@@ -267,7 +271,9 @@
 TEST_F(EventThreadTest, setVsyncRateZeroPostsNoVSyncEventsToThatConnection) {
     // Create a first connection, register it, and request a vsync rate of zero.
     ConnectionEventRecorder firstConnectionEventRecorder{0};
-    sp<MockEventThreadConnection> firstConnection = createConnection(firstConnectionEventRecorder);
+    sp<MockEventThreadConnection> firstConnection =
+            createConnection(firstConnectionEventRecorder,
+                             ISurfaceComposer::eConfigChangedSuppress);
     mThread->setVsyncRate(0, firstConnection);
 
     // By itself, this should not enable vsync events
@@ -277,7 +283,8 @@
     // However if there is another connection which wants events at a nonzero rate.....
     ConnectionEventRecorder secondConnectionEventRecorder{0};
     sp<MockEventThreadConnection> secondConnection =
-            createConnection(secondConnectionEventRecorder);
+            createConnection(secondConnectionEventRecorder,
+                             ISurfaceComposer::eConfigChangedSuppress);
     mThread->setVsyncRate(1, secondConnection);
 
     // EventThread should enable vsync callbacks.
@@ -363,7 +370,9 @@
 
 TEST_F(EventThreadTest, connectionsRemovedIfEventDeliveryError) {
     ConnectionEventRecorder errorConnectionEventRecorder{NO_MEMORY};
-    sp<MockEventThreadConnection> errorConnection = createConnection(errorConnectionEventRecorder);
+    sp<MockEventThreadConnection> errorConnection =
+            createConnection(errorConnectionEventRecorder,
+                             ISurfaceComposer::eConfigChangedSuppress);
     mThread->setVsyncRate(1, errorConnection);
 
     // EventThread should enable vsync callbacks.
@@ -387,7 +396,9 @@
 
 TEST_F(EventThreadTest, eventsDroppedIfNonfatalEventDeliveryError) {
     ConnectionEventRecorder errorConnectionEventRecorder{WOULD_BLOCK};
-    sp<MockEventThreadConnection> errorConnection = createConnection(errorConnectionEventRecorder);
+    sp<MockEventThreadConnection> errorConnection =
+            createConnection(errorConnectionEventRecorder,
+                             ISurfaceComposer::eConfigChangedSuppress);
     mThread->setVsyncRate(1, errorConnection);
 
     // EventThread should enable vsync callbacks.
@@ -449,5 +460,18 @@
     expectConfigChangedEventReceivedByConnection(DISPLAY_ID_64BIT, 7);
 }
 
+TEST_F(EventThreadTest, suppressConfigChanged) {
+    ConnectionEventRecorder suppressConnectionEventRecorder{0};
+    sp<MockEventThreadConnection> suppressConnection =
+            createConnection(suppressConnectionEventRecorder,
+                             ISurfaceComposer::eConfigChangedSuppress);
+
+    mThread->onConfigChanged(INTERNAL_DISPLAY_ID, 9);
+    expectConfigChangedEventReceivedByConnection(INTERNAL_DISPLAY_ID, 9);
+
+    auto args = suppressConnectionEventRecorder.waitForCall();
+    ASSERT_FALSE(args.has_value());
+}
+
 } // namespace
 } // namespace android
diff --git a/services/surfaceflinger/tests/unittests/SchedulerTest.cpp b/services/surfaceflinger/tests/unittests/SchedulerTest.cpp
index 1f8b111..740115e 100644
--- a/services/surfaceflinger/tests/unittests/SchedulerTest.cpp
+++ b/services/surfaceflinger/tests/unittests/SchedulerTest.cpp
@@ -25,7 +25,8 @@
     class MockEventThreadConnection : public android::EventThreadConnection {
     public:
         explicit MockEventThreadConnection(EventThread* eventThread)
-              : EventThreadConnection(eventThread, ResyncCallback()) {}
+              : EventThreadConnection(eventThread, ResyncCallback(),
+                                      ISurfaceComposer::eConfigChangedSuppress) {}
         ~MockEventThreadConnection() = default;
 
         MOCK_METHOD1(stealReceiveChannel, status_t(gui::BitTube* outChannel));
@@ -47,7 +48,7 @@
 
         std::unique_ptr<EventThread> makeEventThread(
                 const char* /* connectionName */, DispSync* /* dispSync */,
-                nsecs_t /* phaseOffsetNs */,
+                nsecs_t /* phaseOffsetNs */, nsecs_t /* offsetThresholdForNextVsync */,
                 impl::EventThread::InterceptVSyncsCallback /* interceptCallback */) override {
             return std::move(mEventThread);
         }
@@ -81,10 +82,10 @@
 
     // createConnection call to scheduler makes a createEventConnection call to EventThread. Make
     // sure that call gets executed and returns an EventThread::Connection object.
-    EXPECT_CALL(*mEventThread, createEventConnection(_))
+    EXPECT_CALL(*mEventThread, createEventConnection(_, _))
             .WillRepeatedly(Return(mEventThreadConnection));
 
-    mConnectionHandle = mScheduler->createConnection("appConnection", 16, ResyncCallback(),
+    mConnectionHandle = mScheduler->createConnection("appConnection", 16, 16, ResyncCallback(),
                                                      impl::EventThread::InterceptVSyncsCallback());
     EXPECT_TRUE(mConnectionHandle != nullptr);
 }
@@ -105,7 +106,10 @@
     // exceptions, just gracefully continues.
     sp<IDisplayEventConnection> returnedValue;
     ASSERT_NO_FATAL_FAILURE(
-            returnedValue = mScheduler->createDisplayEventConnection(nullptr, ResyncCallback()));
+            returnedValue =
+                    mScheduler->createDisplayEventConnection(nullptr, ResyncCallback(),
+                                                             ISurfaceComposer::
+                                                                     eConfigChangedSuppress));
     EXPECT_TRUE(returnedValue == nullptr);
     EXPECT_TRUE(mScheduler->getEventThread(nullptr) == nullptr);
     EXPECT_TRUE(mScheduler->getEventConnection(nullptr) == nullptr);
@@ -126,7 +130,9 @@
     sp<IDisplayEventConnection> returnedValue;
     ASSERT_NO_FATAL_FAILURE(
             returnedValue =
-                    mScheduler->createDisplayEventConnection(connectionHandle, ResyncCallback()));
+                    mScheduler->createDisplayEventConnection(connectionHandle, ResyncCallback(),
+                                                             ISurfaceComposer::
+                                                                     eConfigChangedSuppress));
     EXPECT_TRUE(returnedValue == nullptr);
     EXPECT_TRUE(mScheduler->getEventThread(connectionHandle) == nullptr);
     EXPECT_TRUE(mScheduler->getEventConnection(connectionHandle) == nullptr);
@@ -155,7 +161,9 @@
     sp<IDisplayEventConnection> returnedValue;
     ASSERT_NO_FATAL_FAILURE(
             returnedValue =
-                    mScheduler->createDisplayEventConnection(mConnectionHandle, ResyncCallback()));
+                    mScheduler->createDisplayEventConnection(mConnectionHandle, ResyncCallback(),
+                                                             ISurfaceComposer::
+                                                                     eConfigChangedSuppress));
     EXPECT_TRUE(returnedValue != nullptr);
     ASSERT_EQ(returnedValue, mEventThreadConnection);
 
diff --git a/services/surfaceflinger/tests/unittests/TestableScheduler.h b/services/surfaceflinger/tests/unittests/TestableScheduler.h
index c3d2b8d..cb6980e 100644
--- a/services/surfaceflinger/tests/unittests/TestableScheduler.h
+++ b/services/surfaceflinger/tests/unittests/TestableScheduler.h
@@ -17,6 +17,7 @@
 #pragma once
 
 #include <gmock/gmock.h>
+#include <gui/ISurfaceComposer.h>
 
 #include "Scheduler/EventThread.h"
 #include "Scheduler/RefreshRateConfigs.h"
@@ -34,7 +35,8 @@
     // Scheduler::Connection. This allows plugging in mock::EventThread.
     sp<Scheduler::ConnectionHandle> addConnection(std::unique_ptr<EventThread> eventThread) {
         sp<EventThreadConnection> eventThreadConnection =
-                new EventThreadConnection(eventThread.get(), ResyncCallback());
+                new EventThreadConnection(eventThread.get(), ResyncCallback(),
+                                          ISurfaceComposer::eConfigChangedSuppress);
         const int64_t id = sNextId++;
         mConnections.emplace(id,
                              std::make_unique<Scheduler::Connection>(new ConnectionHandle(id),
diff --git a/services/surfaceflinger/tests/unittests/mock/MockDispSync.h b/services/surfaceflinger/tests/unittests/mock/MockDispSync.h
index 12a349d..9ca116d 100644
--- a/services/surfaceflinger/tests/unittests/mock/MockDispSync.h
+++ b/services/surfaceflinger/tests/unittests/mock/MockDispSync.h
@@ -35,6 +35,7 @@
     MOCK_METHOD0(endResync, void());
     MOCK_METHOD1(setPeriod, void(nsecs_t));
     MOCK_METHOD0(getPeriod, nsecs_t());
+    MOCK_METHOD0(getIntendedPeriod, nsecs_t());
     MOCK_METHOD1(setRefreshSkipCount, void(int));
     MOCK_CONST_METHOD1(computeNextRefresh, nsecs_t(int));
     MOCK_METHOD1(setIgnorePresentFences, void(bool));
diff --git a/services/surfaceflinger/tests/unittests/mock/MockEventThread.h b/services/surfaceflinger/tests/unittests/mock/MockEventThread.h
index 5b5f8e7..ed35ebf 100644
--- a/services/surfaceflinger/tests/unittests/mock/MockEventThread.h
+++ b/services/surfaceflinger/tests/unittests/mock/MockEventThread.h
@@ -28,7 +28,8 @@
     EventThread();
     ~EventThread() override;
 
-    MOCK_CONST_METHOD1(createEventConnection, sp<EventThreadConnection>(ResyncCallback));
+    MOCK_CONST_METHOD2(createEventConnection,
+                       sp<EventThreadConnection>(ResyncCallback, ISurfaceComposer::ConfigChanged));
     MOCK_METHOD0(onScreenReleased, void());
     MOCK_METHOD0(onScreenAcquired, void());
     MOCK_METHOD2(onHotplugReceived, void(PhysicalDisplayId, bool));