diff --git a/services/surfaceflinger/Scheduler/EventThread.cpp b/services/surfaceflinger/Scheduler/EventThread.cpp
index eb6d7e4..b78b92b 100644
--- a/services/surfaceflinger/Scheduler/EventThread.cpp
+++ b/services/surfaceflinger/Scheduler/EventThread.cpp
@@ -384,23 +384,13 @@
     return vsyncEventData;
 }
 
-void EventThread::onScreenReleased() {
+void EventThread::enableSyntheticVsync(bool enable) {
     std::lock_guard<std::mutex> lock(mMutex);
-    if (!mVSyncState || mVSyncState->synthetic) {
+    if (!mVSyncState || mVSyncState->synthetic == enable) {
         return;
     }
 
-    mVSyncState->synthetic = true;
-    mCondition.notify_all();
-}
-
-void EventThread::onScreenAcquired() {
-    std::lock_guard<std::mutex> lock(mMutex);
-    if (!mVSyncState || !mVSyncState->synthetic) {
-        return;
-    }
-
-    mVSyncState->synthetic = false;
+    mVSyncState->synthetic = enable;
     mCondition.notify_all();
 }
 
diff --git a/services/surfaceflinger/Scheduler/EventThread.h b/services/surfaceflinger/Scheduler/EventThread.h
index 347dc4a..5037860 100644
--- a/services/surfaceflinger/Scheduler/EventThread.h
+++ b/services/surfaceflinger/Scheduler/EventThread.h
@@ -106,11 +106,8 @@
     virtual sp<EventThreadConnection> createEventConnection(
             ResyncCallback, EventRegistrationFlags eventRegistration = {}) const = 0;
 
-    // called before the screen is turned off from main thread
-    virtual void onScreenReleased() = 0;
-
-    // called after the screen is turned on from main thread
-    virtual void onScreenAcquired() = 0;
+    // Feed clients with fake VSYNC, e.g. while the display is off.
+    virtual void enableSyntheticVsync(bool) = 0;
 
     virtual void onHotplugReceived(PhysicalDisplayId displayId, bool connected) = 0;
 
@@ -159,11 +156,7 @@
     VsyncEventData getLatestVsyncEventData(
             const sp<EventThreadConnection>& connection) const override;
 
-    // called before the screen is turned off from main thread
-    void onScreenReleased() override;
-
-    // called after the screen is turned on from main thread
-    void onScreenAcquired() override;
+    void enableSyntheticVsync(bool) override;
 
     void onHotplugReceived(PhysicalDisplayId displayId, bool connected) override;
 
diff --git a/services/surfaceflinger/Scheduler/Scheduler.cpp b/services/surfaceflinger/Scheduler/Scheduler.cpp
index dab01ba..0daabe2 100644
--- a/services/surfaceflinger/Scheduler/Scheduler.cpp
+++ b/services/surfaceflinger/Scheduler/Scheduler.cpp
@@ -265,24 +265,16 @@
     thread->onHotplugReceived(displayId, connected);
 }
 
-void Scheduler::onScreenAcquired(ConnectionHandle handle) {
+void Scheduler::enableSyntheticVsync(bool enable) {
+    // TODO(b/241285945): Remove connection handles.
+    const ConnectionHandle handle = mAppConnectionHandle;
     android::EventThread* thread;
     {
         std::lock_guard<std::mutex> lock(mConnectionsLock);
         RETURN_IF_INVALID_HANDLE(handle);
         thread = mConnections[handle].thread.get();
     }
-    thread->onScreenAcquired();
-}
-
-void Scheduler::onScreenReleased(ConnectionHandle handle) {
-    android::EventThread* thread;
-    {
-        std::lock_guard<std::mutex> lock(mConnectionsLock);
-        RETURN_IF_INVALID_HANDLE(handle);
-        thread = mConnections[handle].thread.get();
-    }
-    thread->onScreenReleased();
+    thread->enableSyntheticVsync(enable);
 }
 
 void Scheduler::onFrameRateOverridesChanged(ConnectionHandle handle, PhysicalDisplayId displayId) {
diff --git a/services/surfaceflinger/Scheduler/Scheduler.h b/services/surfaceflinger/Scheduler/Scheduler.h
index a340919..67f4daa 100644
--- a/services/surfaceflinger/Scheduler/Scheduler.h
+++ b/services/surfaceflinger/Scheduler/Scheduler.h
@@ -157,8 +157,8 @@
     void onHotplugReceived(ConnectionHandle, PhysicalDisplayId, bool connected);
     void onPrimaryDisplayModeChanged(ConnectionHandle, const FrameRateMode&) EXCLUDES(mPolicyLock);
     void onNonPrimaryDisplayModeChanged(ConnectionHandle, const FrameRateMode&);
-    void onScreenAcquired(ConnectionHandle);
-    void onScreenReleased(ConnectionHandle);
+
+    void enableSyntheticVsync(bool = true) REQUIRES(kMainThreadContext);
 
     void onFrameRateOverridesChanged(ConnectionHandle, PhysicalDisplayId)
             EXCLUDES(mConnectionsLock);
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 5c8579c..51dc02c 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -5210,7 +5210,6 @@
         return;
     }
 
-    const bool isActiveDisplay = displayId == mActiveDisplayId;
     const bool isInternalDisplay = mPhysicalDisplays.get(displayId)
                                            .transform(&PhysicalDisplay::isInternal)
                                            .value_or(false);
@@ -5247,10 +5246,10 @@
             ALOGW("Couldn't set SCHED_FIFO on display on: %s\n", strerror(errno));
         }
         getHwComposer().setPowerMode(displayId, mode);
-        if (isActiveDisplay && mode != hal::PowerMode::DOZE_SUSPEND) {
+        if (displayId == mActiveDisplayId && mode != hal::PowerMode::DOZE_SUSPEND) {
             setHWCVsyncEnabled(displayId,
                                mScheduler->getVsyncSchedule().getPendingHardwareVsyncState());
-            mScheduler->onScreenAcquired(mAppConnectionHandle);
+            mScheduler->enableSyntheticVsync(false);
             mScheduler->resyncToHardwareVsync(true, refreshRate);
         }
 
@@ -5264,9 +5263,9 @@
         if (SurfaceFlinger::setSchedAttr(false) != NO_ERROR) {
             ALOGW("Couldn't set uclamp.min on display off: %s\n", strerror(errno));
         }
-        if (isActiveDisplay && *currentModeOpt != hal::PowerMode::DOZE_SUSPEND) {
+        if (displayId == mActiveDisplayId && *currentModeOpt != hal::PowerMode::DOZE_SUSPEND) {
             mScheduler->disableHardwareVsync(true);
-            mScheduler->onScreenReleased(mAppConnectionHandle);
+            mScheduler->enableSyntheticVsync();
         }
 
         // Make sure HWVsync is disabled before turning off the display
@@ -5278,18 +5277,18 @@
     } else if (mode == hal::PowerMode::DOZE || mode == hal::PowerMode::ON) {
         // Update display while dozing
         getHwComposer().setPowerMode(displayId, mode);
-        if (isActiveDisplay && *currentModeOpt == hal::PowerMode::DOZE_SUSPEND) {
+        if (displayId == mActiveDisplayId && *currentModeOpt == hal::PowerMode::DOZE_SUSPEND) {
             ALOGI("Force repainting for DOZE_SUSPEND -> DOZE or ON.");
             mVisibleRegionsDirty = true;
             scheduleRepaint();
-            mScheduler->onScreenAcquired(mAppConnectionHandle);
+            mScheduler->enableSyntheticVsync(false);
             mScheduler->resyncToHardwareVsync(true, refreshRate);
         }
     } else if (mode == hal::PowerMode::DOZE_SUSPEND) {
         // Leave display going to doze
-        if (isActiveDisplay) {
+        if (displayId == mActiveDisplayId) {
             mScheduler->disableHardwareVsync(true);
-            mScheduler->onScreenReleased(mAppConnectionHandle);
+            mScheduler->enableSyntheticVsync();
         }
         getHwComposer().setPowerMode(displayId, mode);
     } else {
@@ -5297,7 +5296,7 @@
         getHwComposer().setPowerMode(displayId, mode);
     }
 
-    if (isActiveDisplay) {
+    if (displayId == mActiveDisplayId) {
         mTimeStats->setPowerMode(mode);
         mRefreshRateStats->setPowerMode(mode);
         mScheduler->setDisplayPowerMode(mode);
diff --git a/services/surfaceflinger/fuzzer/surfaceflinger_scheduler_fuzzer.cpp b/services/surfaceflinger/fuzzer/surfaceflinger_scheduler_fuzzer.cpp
index 61fb29a..80486a2 100644
--- a/services/surfaceflinger/fuzzer/surfaceflinger_scheduler_fuzzer.cpp
+++ b/services/surfaceflinger/fuzzer/surfaceflinger_scheduler_fuzzer.cpp
@@ -109,8 +109,7 @@
     thread->setDuration((std::chrono::nanoseconds)mFdp.ConsumeIntegral<uint64_t>(),
                         (std::chrono::nanoseconds)mFdp.ConsumeIntegral<uint64_t>());
     thread->registerDisplayEventConnection(connection);
-    thread->onScreenAcquired();
-    thread->onScreenReleased();
+    thread->enableSyntheticVsync(mFdp.ConsumeBool());
     dump<android::impl::EventThread>(thread.get(), &mFdp);
 }
 
diff --git a/services/surfaceflinger/tests/unittests/SchedulerTest.cpp b/services/surfaceflinger/tests/unittests/SchedulerTest.cpp
index 4b15385..422fa1c 100644
--- a/services/surfaceflinger/tests/unittests/SchedulerTest.cpp
+++ b/services/surfaceflinger/tests/unittests/SchedulerTest.cpp
@@ -122,12 +122,6 @@
     EXPECT_CALL(*mEventThread, onHotplugReceived(_, _)).Times(0);
     mScheduler->onHotplugReceived(handle, kDisplayId1, false);
 
-    EXPECT_CALL(*mEventThread, onScreenAcquired()).Times(0);
-    mScheduler->onScreenAcquired(handle);
-
-    EXPECT_CALL(*mEventThread, onScreenReleased()).Times(0);
-    mScheduler->onScreenReleased(handle);
-
     std::string output;
     EXPECT_CALL(*mEventThread, dump(_)).Times(0);
     mScheduler->dump(handle, output);
@@ -147,12 +141,6 @@
     EXPECT_CALL(*mEventThread, onHotplugReceived(kDisplayId1, false)).Times(1);
     mScheduler->onHotplugReceived(mConnectionHandle, kDisplayId1, false);
 
-    EXPECT_CALL(*mEventThread, onScreenAcquired()).Times(1);
-    mScheduler->onScreenAcquired(mConnectionHandle);
-
-    EXPECT_CALL(*mEventThread, onScreenReleased()).Times(1);
-    mScheduler->onScreenReleased(mConnectionHandle);
-
     std::string output("dump");
     EXPECT_CALL(*mEventThread, dump(output)).Times(1);
     mScheduler->dump(mConnectionHandle, output);
diff --git a/services/surfaceflinger/tests/unittests/SurfaceFlinger_SetPowerModeInternalTest.cpp b/services/surfaceflinger/tests/unittests/SurfaceFlinger_SetPowerModeInternalTest.cpp
index e5f7e65..17b4714 100644
--- a/services/surfaceflinger/tests/unittests/SurfaceFlinger_SetPowerModeInternalTest.cpp
+++ b/services/surfaceflinger/tests/unittests/SurfaceFlinger_SetPowerModeInternalTest.cpp
@@ -59,47 +59,34 @@
 };
 
 struct EventThreadBaseSupportedVariant {
-    static void setupVsyncAndEventThreadNoCallExpectations(DisplayTransactionTest* test) {
-        // The callback should not be notified to toggle VSYNC.
+    static void setupVsyncNoCallExpectations(DisplayTransactionTest* test) {
+        // Expect no change to hardware nor synthetic VSYNC.
         EXPECT_CALL(test->mFlinger.mockSchedulerCallback(), setVsyncEnabled(_)).Times(0);
-
-        // The event thread should not be notified.
-        EXPECT_CALL(*test->mEventThread, onScreenReleased()).Times(0);
-        EXPECT_CALL(*test->mEventThread, onScreenAcquired()).Times(0);
+        EXPECT_CALL(*test->mEventThread, enableSyntheticVsync(_)).Times(0);
     }
 };
 
 struct EventThreadNotSupportedVariant : public EventThreadBaseSupportedVariant {
-    static void setupAcquireAndEnableVsyncCallExpectations(DisplayTransactionTest* test) {
-        // These calls are only expected for the primary display.
-
-        // Instead expect no calls.
-        setupVsyncAndEventThreadNoCallExpectations(test);
+    static void setupEnableVsyncCallExpectations(DisplayTransactionTest* test) {
+        setupVsyncNoCallExpectations(test);
     }
 
-    static void setupReleaseAndDisableVsyncCallExpectations(DisplayTransactionTest* test) {
-        // These calls are only expected for the primary display.
-
-        // Instead expect no calls.
-        setupVsyncAndEventThreadNoCallExpectations(test);
+    static void setupDisableVsyncCallExpectations(DisplayTransactionTest* test) {
+        setupVsyncNoCallExpectations(test);
     }
 };
 
 struct EventThreadIsSupportedVariant : public EventThreadBaseSupportedVariant {
-    static void setupAcquireAndEnableVsyncCallExpectations(DisplayTransactionTest* test) {
-        // The callback should be notified to enable VSYNC.
+    static void setupEnableVsyncCallExpectations(DisplayTransactionTest* test) {
+        // Expect to enable hardware VSYNC and disable synthetic VSYNC.
         EXPECT_CALL(test->mFlinger.mockSchedulerCallback(), setVsyncEnabled(true)).Times(1);
-
-        // The event thread should be notified that the screen was acquired.
-        EXPECT_CALL(*test->mEventThread, onScreenAcquired()).Times(1);
+        EXPECT_CALL(*test->mEventThread, enableSyntheticVsync(false)).Times(1);
     }
 
-    static void setupReleaseAndDisableVsyncCallExpectations(DisplayTransactionTest* test) {
-        // The callback should be notified to disable VSYNC.
+    static void setupDisableVsyncCallExpectations(DisplayTransactionTest* test) {
+        // Expect to disable hardware VSYNC and enable synthetic VSYNC.
         EXPECT_CALL(test->mFlinger.mockSchedulerCallback(), setVsyncEnabled(false)).Times(1);
-
-        // The event thread should not be notified that the screen was released.
-        EXPECT_CALL(*test->mEventThread, onScreenReleased()).Times(1);
+        EXPECT_CALL(*test->mEventThread, enableSyntheticVsync(true)).Times(1);
     }
 };
 
@@ -133,7 +120,7 @@
     template <typename Case>
     static void setupCallExpectations(DisplayTransactionTest* test) {
         Case::setupComposerCallExpectations(test, IComposerClient::PowerMode::ON);
-        Case::EventThread::setupAcquireAndEnableVsyncCallExpectations(test);
+        Case::EventThread::setupEnableVsyncCallExpectations(test);
         Case::DispSync::setupResetModelCallExpectations(test);
         Case::setupRepaintEverythingCallExpectations(test);
     }
@@ -148,7 +135,7 @@
     template <typename Case>
     static void setupCallExpectations(DisplayTransactionTest* test) {
         Case::setupComposerCallExpectations(test, Case::Doze::ACTUAL_POWER_MODE_FOR_DOZE_SUSPEND);
-        Case::EventThread::setupVsyncAndEventThreadNoCallExpectations(test);
+        Case::EventThread::setupVsyncNoCallExpectations(test);
         Case::setupRepaintEverythingCallExpectations(test);
     }
 
@@ -160,7 +147,7 @@
 struct TransitionOnToOffVariant : public TransitionVariantCommon<PowerMode::ON, PowerMode::OFF> {
     template <typename Case>
     static void setupCallExpectations(DisplayTransactionTest* test) {
-        Case::EventThread::setupReleaseAndDisableVsyncCallExpectations(test);
+        Case::EventThread::setupDisableVsyncCallExpectations(test);
         Case::setupComposerCallExpectations(test, IComposerClient::PowerMode::OFF);
     }
 
@@ -173,7 +160,7 @@
       : public TransitionVariantCommon<PowerMode::DOZE_SUSPEND, PowerMode::OFF> {
     template <typename Case>
     static void setupCallExpectations(DisplayTransactionTest* test) {
-        Case::EventThread::setupVsyncAndEventThreadNoCallExpectations(test);
+        Case::EventThread::setupVsyncNoCallExpectations(test);
         Case::setupComposerCallExpectations(test, IComposerClient::PowerMode::OFF);
     }
 
@@ -185,7 +172,7 @@
 struct TransitionOnToDozeVariant : public TransitionVariantCommon<PowerMode::ON, PowerMode::DOZE> {
     template <typename Case>
     static void setupCallExpectations(DisplayTransactionTest* test) {
-        Case::EventThread::setupVsyncAndEventThreadNoCallExpectations(test);
+        Case::EventThread::setupVsyncNoCallExpectations(test);
         Case::setupComposerCallExpectations(test, Case::Doze::ACTUAL_POWER_MODE_FOR_DOZE);
     }
 };
@@ -194,7 +181,7 @@
       : public TransitionVariantCommon<PowerMode::DOZE_SUSPEND, PowerMode::DOZE> {
     template <typename Case>
     static void setupCallExpectations(DisplayTransactionTest* test) {
-        Case::EventThread::setupAcquireAndEnableVsyncCallExpectations(test);
+        Case::EventThread::setupEnableVsyncCallExpectations(test);
         Case::DispSync::setupResetModelCallExpectations(test);
         Case::setupComposerCallExpectations(test, Case::Doze::ACTUAL_POWER_MODE_FOR_DOZE);
     }
@@ -203,7 +190,7 @@
 struct TransitionDozeToOnVariant : public TransitionVariantCommon<PowerMode::DOZE, PowerMode::ON> {
     template <typename Case>
     static void setupCallExpectations(DisplayTransactionTest* test) {
-        Case::EventThread::setupVsyncAndEventThreadNoCallExpectations(test);
+        Case::EventThread::setupVsyncNoCallExpectations(test);
         Case::setupComposerCallExpectations(test, IComposerClient::PowerMode::ON);
     }
 };
@@ -212,7 +199,7 @@
       : public TransitionVariantCommon<PowerMode::DOZE_SUSPEND, PowerMode::ON> {
     template <typename Case>
     static void setupCallExpectations(DisplayTransactionTest* test) {
-        Case::EventThread::setupAcquireAndEnableVsyncCallExpectations(test);
+        Case::EventThread::setupEnableVsyncCallExpectations(test);
         Case::DispSync::setupResetModelCallExpectations(test);
         Case::setupComposerCallExpectations(test, IComposerClient::PowerMode::ON);
     }
@@ -222,7 +209,7 @@
       : public TransitionVariantCommon<PowerMode::ON, PowerMode::DOZE_SUSPEND> {
     template <typename Case>
     static void setupCallExpectations(DisplayTransactionTest* test) {
-        Case::EventThread::setupReleaseAndDisableVsyncCallExpectations(test);
+        Case::EventThread::setupDisableVsyncCallExpectations(test);
         Case::setupComposerCallExpectations(test, Case::Doze::ACTUAL_POWER_MODE_FOR_DOZE_SUSPEND);
     }
 };
@@ -231,7 +218,7 @@
       : public TransitionVariantCommon<PowerMode::ON, static_cast<PowerMode>(POWER_MODE_LEET)> {
     template <typename Case>
     static void setupCallExpectations(DisplayTransactionTest* test) {
-        Case::EventThread::setupVsyncAndEventThreadNoCallExpectations(test);
+        Case::EventThread::setupVsyncNoCallExpectations(test);
         Case::setupNoComposerPowerModeCallExpectations(test);
     }
 };
diff --git a/services/surfaceflinger/tests/unittests/TestableScheduler.h b/services/surfaceflinger/tests/unittests/TestableScheduler.h
index bd3f3ca..48c5d48 100644
--- a/services/surfaceflinger/tests/unittests/TestableScheduler.h
+++ b/services/surfaceflinger/tests/unittests/TestableScheduler.h
@@ -91,6 +91,7 @@
         Scheduler::setLeaderDisplay(displayId);
     }
 
+    auto& mutableAppConnectionHandle() { return mAppConnectionHandle; }
     auto& mutableVsyncModulator() { return *mVsyncModulator; }
     auto& mutableLayerHistory() { return mLayerHistory; }
 
diff --git a/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h b/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h
index 8703359..4488038 100644
--- a/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h
+++ b/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h
@@ -252,7 +252,10 @@
 
         mScheduler->initVsync(mScheduler->getVsyncSchedule().getDispatch(), *mTokenManager, 0ms);
 
-        mFlinger->mAppConnectionHandle = mScheduler->createConnection(std::move(appEventThread));
+        mScheduler->mutableAppConnectionHandle() =
+                mScheduler->createConnection(std::move(appEventThread));
+
+        mFlinger->mAppConnectionHandle = mScheduler->mutableAppConnectionHandle();
         mFlinger->mSfConnectionHandle = mScheduler->createConnection(std::move(sfEventThread));
         resetScheduler(mScheduler);
     }
diff --git a/services/surfaceflinger/tests/unittests/mock/MockEventThread.h b/services/surfaceflinger/tests/unittests/mock/MockEventThread.h
index f8567bd..8026a7a 100644
--- a/services/surfaceflinger/tests/unittests/mock/MockEventThread.h
+++ b/services/surfaceflinger/tests/unittests/mock/MockEventThread.h
@@ -31,8 +31,7 @@
 
     MOCK_CONST_METHOD2(createEventConnection,
                        sp<EventThreadConnection>(ResyncCallback, EventRegistrationFlags));
-    MOCK_METHOD0(onScreenReleased, void());
-    MOCK_METHOD0(onScreenAcquired, void());
+    MOCK_METHOD(void, enableSyntheticVsync, (bool), (override));
     MOCK_METHOD2(onHotplugReceived, void(PhysicalDisplayId, bool));
     MOCK_METHOD1(onModeChanged, void(const scheduler::FrameRateMode &));
     MOCK_METHOD2(onFrameRateOverridesChanged,