Merge "Remove DisplayInfo not found log" into udc-dev
diff --git a/include/input/InputTransport.h b/include/input/InputTransport.h
index 1c52792..a1be542 100644
--- a/include/input/InputTransport.h
+++ b/include/input/InputTransport.h
@@ -38,6 +38,7 @@
 #include <binder/IBinder.h>
 #include <binder/Parcelable.h>
 #include <input/Input.h>
+#include <input/InputVerifier.h>
 #include <sys/stat.h>
 #include <ui/Transform.h>
 #include <utils/BitSet.h>
@@ -444,6 +445,7 @@
 
 private:
     std::shared_ptr<InputChannel> mChannel;
+    InputVerifier mInputVerifier;
 };
 
 /*
diff --git a/include/input/InputVerifier.h b/include/input/InputVerifier.h
new file mode 100644
index 0000000..d4589f5
--- /dev/null
+++ b/include/input/InputVerifier.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <input/Input.h>
+#include <map>
+
+namespace android {
+
+/*
+ * Crash if the provided touch stream is inconsistent.
+ *
+ * TODO(b/211379801): Add support for hover events:
+ * - No hover move without enter
+ * - No touching pointers when hover enter
+ * - No hovering pointers when touching
+ * - Only 1 hovering pointer max
+ */
+class InputVerifier {
+public:
+    InputVerifier(const std::string& name);
+
+    void processMovement(int32_t deviceId, int32_t action, uint32_t pointerCount,
+                         const PointerProperties* pointerProperties,
+                         const PointerCoords* pointerCoords, int32_t flags);
+
+private:
+    const std::string mName;
+    std::map<int32_t /*deviceId*/, std::bitset<MAX_POINTER_ID + 1>> mTouchingPointerIdsByDevice;
+    void ensureTouchingPointersMatch(int32_t deviceId, uint32_t pointerCount,
+                                     const PointerProperties* pointerProperties,
+                                     const char* action) const;
+};
+
+} // namespace android
diff --git a/libs/input/Android.bp b/libs/input/Android.bp
index 3809b6d..48cb72c 100644
--- a/libs/input/Android.bp
+++ b/libs/input/Android.bp
@@ -47,6 +47,7 @@
         "Input.cpp",
         "InputDevice.cpp",
         "InputEventLabels.cpp",
+        "InputVerifier.cpp",
         "Keyboard.cpp",
         "KeyCharacterMap.cpp",
         "KeyLayoutMap.cpp",
diff --git a/libs/input/InputTransport.cpp b/libs/input/InputTransport.cpp
index 9f0a314..d1cd50c 100644
--- a/libs/input/InputTransport.cpp
+++ b/libs/input/InputTransport.cpp
@@ -76,6 +76,14 @@
  */
 static const char* PROPERTY_RESAMPLING_ENABLED = "ro.input.resampling";
 
+/**
+ * Crash if the events that are getting sent to the InputPublisher are inconsistent.
+ * Enable this via "adb shell setprop log.tag.InputTransportVerifyEvents DEBUG"
+ */
+static bool verifyEvents() {
+    return __android_log_is_loggable(ANDROID_LOG_DEBUG, LOG_TAG "VerifyEvents", ANDROID_LOG_INFO);
+}
+
 template<typename T>
 inline static T min(const T& a, const T& b) {
     return a < b ? a : b;
@@ -492,7 +500,8 @@
 
 // --- InputPublisher ---
 
-InputPublisher::InputPublisher(const std::shared_ptr<InputChannel>& channel) : mChannel(channel) {}
+InputPublisher::InputPublisher(const std::shared_ptr<InputChannel>& channel)
+      : mChannel(channel), mInputVerifier(channel->getName()) {}
 
 InputPublisher::~InputPublisher() {
 }
@@ -555,6 +564,10 @@
                 mChannel->getName().c_str(), action);
         ATRACE_NAME(message.c_str());
     }
+    if (verifyEvents()) {
+        mInputVerifier.processMovement(deviceId, action, pointerCount, pointerProperties,
+                                       pointerCoords, flags);
+    }
     if (DEBUG_TRANSPORT_ACTIONS) {
         std::string transformString;
         transform.dump(transformString, "transform", "        ");
diff --git a/libs/input/InputVerifier.cpp b/libs/input/InputVerifier.cpp
new file mode 100644
index 0000000..eb75804
--- /dev/null
+++ b/libs/input/InputVerifier.cpp
@@ -0,0 +1,128 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "InputVerifier"
+
+#include <android-base/logging.h>
+#include <input/InputVerifier.h>
+
+namespace android {
+
+/**
+ * Log all of the movements that are sent to this verifier. Helps to identify the streams that lead
+ * to inconsistent events.
+ * Enable this via "adb shell setprop log.tag.InputVerifierLogEvents DEBUG"
+ */
+static bool logEvents() {
+    return __android_log_is_loggable(ANDROID_LOG_DEBUG, LOG_TAG "LogEvents", ANDROID_LOG_INFO);
+}
+
+// --- InputVerifier ---
+
+InputVerifier::InputVerifier(const std::string& name) : mName(name){};
+
+void InputVerifier::processMovement(int32_t deviceId, int32_t action, uint32_t pointerCount,
+                                    const PointerProperties* pointerProperties,
+                                    const PointerCoords* pointerCoords, int32_t flags) {
+    if (logEvents()) {
+        LOG(ERROR) << "Processing " << MotionEvent::actionToString(action) << " for device "
+                   << deviceId << " (" << pointerCount << " pointer"
+                   << (pointerCount == 1 ? "" : "s") << ") on " << mName;
+    }
+
+    switch (MotionEvent::getActionMasked(action)) {
+        case AMOTION_EVENT_ACTION_DOWN: {
+            auto [it, inserted] = mTouchingPointerIdsByDevice.insert({deviceId, {}});
+            if (!inserted) {
+                LOG(FATAL) << "Got ACTION_DOWN, but already have touching pointers " << it->second
+                           << " for device " << deviceId << " on " << mName;
+            }
+            it->second.set(pointerProperties[0].id);
+            break;
+        }
+        case AMOTION_EVENT_ACTION_POINTER_DOWN: {
+            auto it = mTouchingPointerIdsByDevice.find(deviceId);
+            if (it == mTouchingPointerIdsByDevice.end()) {
+                LOG(FATAL) << "Got POINTER_DOWN, but no touching pointers for device " << deviceId
+                           << " on " << mName;
+            }
+            it->second.set(pointerProperties[MotionEvent::getActionIndex(action)].id);
+            break;
+        }
+        case AMOTION_EVENT_ACTION_MOVE: {
+            ensureTouchingPointersMatch(deviceId, pointerCount, pointerProperties, "MOVE");
+            break;
+        }
+        case AMOTION_EVENT_ACTION_POINTER_UP: {
+            auto it = mTouchingPointerIdsByDevice.find(deviceId);
+            if (it == mTouchingPointerIdsByDevice.end()) {
+                LOG(FATAL) << "Got POINTER_UP, but no touching pointers for device " << deviceId
+                           << " on " << mName;
+            }
+            it->second.reset(pointerProperties[MotionEvent::getActionIndex(action)].id);
+            break;
+        }
+        case AMOTION_EVENT_ACTION_UP: {
+            auto it = mTouchingPointerIdsByDevice.find(deviceId);
+            if (it == mTouchingPointerIdsByDevice.end()) {
+                LOG(FATAL) << "Got ACTION_UP, but no record for deviceId " << deviceId << " on "
+                           << mName;
+            }
+            const auto& [_, touchingPointerIds] = *it;
+            if (touchingPointerIds.count() != 1) {
+                LOG(FATAL) << "Got ACTION_UP, but we have pointers: " << touchingPointerIds
+                           << " for deviceId " << deviceId << " on " << mName;
+            }
+            const int32_t pointerId = pointerProperties[0].id;
+            if (!touchingPointerIds.test(pointerId)) {
+                LOG(FATAL) << "Got ACTION_UP, but pointerId " << pointerId
+                           << " is not touching. Touching pointers: " << touchingPointerIds
+                           << " for deviceId " << deviceId << " on " << mName;
+            }
+            mTouchingPointerIdsByDevice.erase(it);
+            break;
+        }
+        case AMOTION_EVENT_ACTION_CANCEL: {
+            if ((flags & AMOTION_EVENT_FLAG_CANCELED) != AMOTION_EVENT_FLAG_CANCELED) {
+                LOG(FATAL) << "For ACTION_CANCEL, must set FLAG_CANCELED";
+            }
+            ensureTouchingPointersMatch(deviceId, pointerCount, pointerProperties, "CANCEL");
+            mTouchingPointerIdsByDevice.erase(deviceId);
+            break;
+        }
+    }
+}
+
+void InputVerifier::ensureTouchingPointersMatch(int32_t deviceId, uint32_t pointerCount,
+                                                const PointerProperties* pointerProperties,
+                                                const char* action) const {
+    auto it = mTouchingPointerIdsByDevice.find(deviceId);
+    if (it == mTouchingPointerIdsByDevice.end()) {
+        LOG(FATAL) << "Got " << action << ", but no touching pointers for device " << deviceId
+                   << " on " << mName;
+    }
+    const auto& [_, touchingPointerIds] = *it;
+    for (size_t i = 0; i < pointerCount; i++) {
+        const int32_t pointerId = pointerProperties[i].id;
+        if (!touchingPointerIds.test(pointerId)) {
+            LOG(FATAL) << "Got " << action << " for pointerId " << pointerId
+                       << " but the touching pointers are " << touchingPointerIds << " on "
+                       << mName;
+        }
+    }
+};
+
+} // namespace android
diff --git a/services/inputflinger/dispatcher/InputState.cpp b/services/inputflinger/dispatcher/InputState.cpp
index cc9cc4e..94f3813 100644
--- a/services/inputflinger/dispatcher/InputState.cpp
+++ b/services/inputflinger/dispatcher/InputState.cpp
@@ -247,10 +247,19 @@
 }
 
 void InputState::MotionMemento::setPointers(const MotionEntry& entry) {
-    pointerCount = entry.pointerCount;
+    pointerCount = 0;
     for (uint32_t i = 0; i < entry.pointerCount; i++) {
-        pointerProperties[i].copyFrom(entry.pointerProperties[i]);
-        pointerCoords[i].copyFrom(entry.pointerCoords[i]);
+        if (MotionEvent::getActionMasked(entry.action) == AMOTION_EVENT_ACTION_POINTER_UP) {
+            // In POINTER_UP events, the pointer is leaving. Since the action is not stored,
+            // this departing pointer should not be recorded.
+            const uint8_t actionIndex = MotionEvent::getActionIndex(entry.action);
+            if (i == actionIndex) {
+                continue;
+            }
+        }
+        pointerProperties[pointerCount].copyFrom(entry.pointerProperties[i]);
+        pointerCoords[pointerCount].copyFrom(entry.pointerCoords[i]);
+        pointerCount++;
     }
 }
 
diff --git a/services/inputflinger/tests/InputDispatcher_test.cpp b/services/inputflinger/tests/InputDispatcher_test.cpp
index bd9038d..df1787b 100644
--- a/services/inputflinger/tests/InputDispatcher_test.cpp
+++ b/services/inputflinger/tests/InputDispatcher_test.cpp
@@ -1945,6 +1945,48 @@
 }
 
 /**
+ * Two fingers down on the window, and lift off the first finger.
+ * Next, cancel the gesture to the window by removing the window. Make sure that the CANCEL event
+ * contains a single pointer.
+ */
+TEST_F(InputDispatcherTest, CancelAfterPointer0Up) {
+    std::shared_ptr<FakeApplicationHandle> application = std::make_shared<FakeApplicationHandle>();
+    sp<FakeWindowHandle> window =
+            sp<FakeWindowHandle>::make(application, mDispatcher, "Window", ADISPLAY_ID_DEFAULT);
+
+    mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {window}}});
+    NotifyMotionArgs args;
+    // First touch pointer down on right window
+    mDispatcher->notifyMotion(&(
+            args = MotionArgsBuilder(ACTION_DOWN, AINPUT_SOURCE_TOUCHSCREEN)
+                           .pointer(PointerBuilder(0, AMOTION_EVENT_TOOL_TYPE_FINGER).x(100).y(100))
+                           .build()));
+    // Second touch pointer down
+    mDispatcher->notifyMotion(&(
+            args = MotionArgsBuilder(POINTER_1_DOWN, AINPUT_SOURCE_TOUCHSCREEN)
+
+                           .pointer(PointerBuilder(0, AMOTION_EVENT_TOOL_TYPE_FINGER).x(100).y(100))
+                           .pointer(PointerBuilder(1, AMOTION_EVENT_TOOL_TYPE_FINGER).x(110).y(100))
+                           .build()));
+    // First touch pointer lifts. The second one remains down
+    mDispatcher->notifyMotion(&(
+            args = MotionArgsBuilder(POINTER_0_UP, AINPUT_SOURCE_TOUCHSCREEN)
+
+                           .pointer(PointerBuilder(0, AMOTION_EVENT_TOOL_TYPE_FINGER).x(100).y(100))
+                           .pointer(PointerBuilder(1, AMOTION_EVENT_TOOL_TYPE_FINGER).x(110).y(100))
+                           .build()));
+    window->consumeMotionEvent(WithMotionAction(ACTION_DOWN));
+    window->consumeMotionEvent(WithMotionAction(POINTER_1_DOWN));
+    window->consumeMotionEvent(WithMotionAction(POINTER_0_UP));
+
+    // Remove the window. The gesture should be canceled
+    mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {}}});
+    const std::map<int32_t, PointF> expectedPointers{{1, PointF{110, 100}}};
+    window->consumeMotionEvent(
+            AllOf(WithMotionAction(ACTION_CANCEL), WithPointers(expectedPointers)));
+}
+
+/**
  * Same test as WhenForegroundWindowDisappears_WallpaperTouchIsCanceled above,
  * with the following differences:
  * After ACTION_DOWN, Wallpaper window hangs up its channel, which forces the dispatcher to
@@ -2052,8 +2094,17 @@
     wallpaperWindow->consumeMotionPointerUp(0, ADISPLAY_ID_DEFAULT, expectedWallpaperFlags);
 
     ASSERT_EQ(InputEventInjectionResult::SUCCEEDED,
-              injectMotionUp(mDispatcher, AINPUT_SOURCE_TOUCHSCREEN, ADISPLAY_ID_DEFAULT,
-                             {100, 100}))
+              injectMotionEvent(mDispatcher,
+                                MotionEventBuilder(AMOTION_EVENT_ACTION_UP,
+                                                   AINPUT_SOURCE_TOUCHSCREEN)
+                                        .displayId(ADISPLAY_ID_DEFAULT)
+                                        .eventTime(systemTime(SYSTEM_TIME_MONOTONIC))
+                                        .pointer(PointerBuilder(/* id */ 1,
+                                                                AMOTION_EVENT_TOOL_TYPE_FINGER)
+                                                         .x(100)
+                                                         .y(100))
+                                        .build(),
+                                INJECT_EVENT_TIMEOUT, InputEventInjectionSync::WAIT_FOR_RESULT))
             << "Inject motion event should return InputEventInjectionResult::SUCCEEDED";
     foregroundWindow->consumeMotionUp(ADISPLAY_ID_DEFAULT);
     wallpaperWindow->consumeMotionUp(ADISPLAY_ID_DEFAULT, expectedWallpaperFlags);
@@ -2490,7 +2541,7 @@
     const int32_t mouseDeviceId = 6;
     NotifyMotionArgs args;
 
-    // First touch pointer down on right window
+    // First touch pointer down
     mDispatcher->notifyMotion(&(
             args = MotionArgsBuilder(ACTION_DOWN, AINPUT_SOURCE_TOUCHSCREEN)
                            .deviceId(touchDeviceId)
@@ -2523,7 +2574,7 @@
                            .build()));
 
     window->consumeMotionEvent(AllOf(WithMotionAction(ACTION_CANCEL), WithDeviceId(touchDeviceId),
-                                     WithPointerCount(2u)));
+                                     WithPointerCount(1u)));
     window->consumeMotionEvent(AllOf(WithMotionAction(ACTION_DOWN), WithDeviceId(mouseDeviceId)));
 
     mDispatcher->notifyMotion(&(
@@ -3007,8 +3058,8 @@
     window1->assertNoEvents();
 
     // Now move the pointer on the first window
-    mDispatcher->notifyMotion(
-            &(args = generateTouchArgs(AMOTION_EVENT_ACTION_MOVE, {{51, 51}, {151, 51}})));
+    mDispatcher->notifyMotion(&(
+            args = generateTouchArgs(AMOTION_EVENT_ACTION_MOVE, {{51, 51}, {151, 51}, {150, 50}})));
     mDispatcher->waitForIdle();
     window1->consumeMotionEvent(WithDownTime(downTimeForWindow1));
 
@@ -3440,6 +3491,42 @@
 }
 
 /**
+ * If mouse is hovering when the touch goes down, the hovering should be stopped via HOVER_EXIT.
+ */
+TEST_F(InputDispatcherTest, TouchDownAfterMouseHover) {
+    std::shared_ptr<FakeApplicationHandle> application = std::make_shared<FakeApplicationHandle>();
+    sp<FakeWindowHandle> window =
+            sp<FakeWindowHandle>::make(application, mDispatcher, "Window", ADISPLAY_ID_DEFAULT);
+    window->setFrame(Rect(0, 0, 100, 100));
+
+    mDispatcher->setInputWindows({{ADISPLAY_ID_DEFAULT, {window}}});
+
+    const int32_t mouseDeviceId = 7;
+    const int32_t touchDeviceId = 4;
+    NotifyMotionArgs args;
+
+    // Start hovering with the mouse
+    mDispatcher->notifyMotion(
+            &(args = MotionArgsBuilder(ACTION_HOVER_ENTER, AINPUT_SOURCE_MOUSE)
+                             .deviceId(mouseDeviceId)
+                             .pointer(PointerBuilder(0, AMOTION_EVENT_TOOL_TYPE_MOUSE).x(10).y(10))
+                             .build()));
+    window->consumeMotionEvent(
+            AllOf(WithMotionAction(ACTION_HOVER_ENTER), WithDeviceId(mouseDeviceId)));
+
+    // Touch goes down
+    mDispatcher->notifyMotion(
+            &(args = MotionArgsBuilder(ACTION_DOWN, AINPUT_SOURCE_TOUCHSCREEN)
+                             .deviceId(touchDeviceId)
+                             .pointer(PointerBuilder(0, AMOTION_EVENT_TOOL_TYPE_FINGER).x(50).y(50))
+                             .build()));
+
+    window->consumeMotionEvent(
+            AllOf(WithMotionAction(ACTION_HOVER_EXIT), WithDeviceId(mouseDeviceId)));
+    window->consumeMotionEvent(AllOf(WithMotionAction(ACTION_DOWN), WithDeviceId(touchDeviceId)));
+}
+
+/**
  * Inject a mouse hover event followed by a tap from touchscreen.
  * The tap causes a HOVER_EXIT event to be generated because the current event
  * stream's source has been switched.
@@ -5465,6 +5552,13 @@
     windowInSecondary->consumeMotionDown(SECOND_DISPLAY_ID);
     monitorInSecondary.consumeMotionDown(SECOND_DISPLAY_ID);
 
+    // Lift up the touch from the second display
+    ASSERT_EQ(InputEventInjectionResult::SUCCEEDED,
+              injectMotionUp(mDispatcher, AINPUT_SOURCE_TOUCHSCREEN, SECOND_DISPLAY_ID))
+            << "Inject motion event should return InputEventInjectionResult::SUCCEEDED";
+    windowInSecondary->consumeMotionUp(SECOND_DISPLAY_ID);
+    monitorInSecondary.consumeMotionUp(SECOND_DISPLAY_ID);
+
     // Test inject a non-pointer motion event.
     // If specific a display, it will dispatch to the focused window of particular display,
     // or it will dispatch to the focused window of focused display.
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/Scheduler/VsyncSchedule.h b/services/surfaceflinger/Scheduler/VsyncSchedule.h
index d88f1d1..a32acc7 100644
--- a/services/surfaceflinger/Scheduler/VsyncSchedule.h
+++ b/services/surfaceflinger/Scheduler/VsyncSchedule.h
@@ -20,6 +20,7 @@
 #include <string>
 
 #include <ThreadContext.h>
+#include <android-base/thread_annotations.h>
 #include <ftl/enum.h>
 #include <ftl/optional.h>
 #include <scheduler/Features.h>
@@ -27,6 +28,7 @@
 
 namespace android {
 class EventThreadTest;
+class VsyncScheduleTest;
 }
 
 namespace android::fuzz {
@@ -96,6 +98,7 @@
 private:
     friend class TestableScheduler;
     friend class android::EventThreadTest;
+    friend class android::VsyncScheduleTest;
     friend class android::fuzz::SchedulerFuzzer;
 
     using TrackerPtr = std::unique_ptr<VsyncTracker>;
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/Android.bp b/services/surfaceflinger/tests/unittests/Android.bp
index 87c3c65..eac9edc 100644
--- a/services/surfaceflinger/tests/unittests/Android.bp
+++ b/services/surfaceflinger/tests/unittests/Android.bp
@@ -105,6 +105,7 @@
         "SurfaceFlinger_DisplayTransactionCommitTest.cpp",
         "SurfaceFlinger_GetDisplayNativePrimariesTest.cpp",
         "SurfaceFlinger_HotplugTest.cpp",
+        "SurfaceFlinger_MultiDisplayLeaderTest.cpp",
         "SurfaceFlinger_NotifyPowerBoostTest.cpp",
         "SurfaceFlinger_OnInitializeDisplaysTest.cpp",
         "SurfaceFlinger_PowerHintTest.cpp",
@@ -133,6 +134,7 @@
         "VSyncPredictorTest.cpp",
         "VSyncReactorTest.cpp",
         "VsyncConfigurationTest.cpp",
+        "VsyncScheduleTest.cpp",
     ],
 }
 
diff --git a/services/surfaceflinger/tests/unittests/DisplayTransactionTestHelpers.h b/services/surfaceflinger/tests/unittests/DisplayTransactionTestHelpers.h
index 23a8bd1..57d1d9c 100644
--- a/services/surfaceflinger/tests/unittests/DisplayTransactionTestHelpers.h
+++ b/services/surfaceflinger/tests/unittests/DisplayTransactionTestHelpers.h
@@ -503,14 +503,16 @@
     static constexpr auto GET_IDENTIFICATION_DATA = getInternalEdid;
 };
 
-template <bool hasIdentificationData>
-struct ExternalDisplay {
-    static constexpr auto CONNECTION_TYPE = ui::DisplayConnectionType::External;
+template <ui::DisplayConnectionType connectionType, bool hasIdentificationData>
+struct SecondaryDisplay {
+    static constexpr auto CONNECTION_TYPE = connectionType;
     static constexpr Primary PRIMARY = Primary::FALSE;
     static constexpr uint8_t PORT = 254;
     static constexpr HWDisplayId HWC_DISPLAY_ID = 1002;
     static constexpr bool HAS_IDENTIFICATION_DATA = hasIdentificationData;
-    static constexpr auto GET_IDENTIFICATION_DATA = getExternalEdid;
+    static constexpr auto GET_IDENTIFICATION_DATA =
+            connectionType == ui::DisplayConnectionType::Internal ? getInternalEdid
+                                                                  : getExternalEdid;
 };
 
 struct TertiaryDisplay {
@@ -521,7 +523,16 @@
 };
 
 using PrimaryDisplayVariant = PhysicalDisplayVariant<PrimaryDisplay<false>, 3840, 2160>;
-using ExternalDisplayVariant = PhysicalDisplayVariant<ExternalDisplay<false>, 1920, 1280>;
+
+using InnerDisplayVariant = PhysicalDisplayVariant<PrimaryDisplay<true>, 1840, 2208>;
+using OuterDisplayVariant =
+        PhysicalDisplayVariant<SecondaryDisplay<ui::DisplayConnectionType::Internal, true>, 1080,
+                               2092>;
+
+using ExternalDisplayVariant =
+        PhysicalDisplayVariant<SecondaryDisplay<ui::DisplayConnectionType::External, false>, 1920,
+                               1280>;
+
 using TertiaryDisplayVariant = PhysicalDisplayVariant<TertiaryDisplay, 1600, 1200>;
 
 // A virtual display not supported by the HWC.
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_MultiDisplayLeaderTest.cpp b/services/surfaceflinger/tests/unittests/SurfaceFlinger_MultiDisplayLeaderTest.cpp
new file mode 100644
index 0000000..9c58943
--- /dev/null
+++ b/services/surfaceflinger/tests/unittests/SurfaceFlinger_MultiDisplayLeaderTest.cpp
@@ -0,0 +1,81 @@
+/*
+ * Copyright 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#undef LOG_TAG
+#define LOG_TAG "LibSurfaceFlingerUnittests"
+
+#include "DisplayTransactionTestHelpers.h"
+
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+namespace android {
+namespace {
+
+struct MultiDisplayLeaderTest : DisplayTransactionTest {
+    static constexpr bool kWithMockScheduler = false;
+    MultiDisplayLeaderTest() : DisplayTransactionTest(kWithMockScheduler) {}
+};
+
+TEST_F(MultiDisplayLeaderTest, foldable) {
+    injectMockScheduler(InnerDisplayVariant::DISPLAY_ID::get());
+
+    // Inject inner and outer displays with uninitialized power modes.
+    sp<DisplayDevice> innerDisplay, outerDisplay;
+    constexpr bool kInitPowerMode = false;
+    {
+        InnerDisplayVariant::injectHwcDisplay<kInitPowerMode>(this);
+        auto injector = InnerDisplayVariant::makeFakeExistingDisplayInjector(this);
+        injector.setPowerMode(std::nullopt);
+        injector.setRefreshRateSelector(mFlinger.scheduler()->refreshRateSelector());
+        innerDisplay = injector.inject();
+    }
+    {
+        OuterDisplayVariant::injectHwcDisplay<kInitPowerMode>(this);
+        auto injector = OuterDisplayVariant::makeFakeExistingDisplayInjector(this);
+        injector.setPowerMode(std::nullopt);
+        outerDisplay = injector.inject();
+    }
+
+    // When the device boots, the inner display should be the leader.
+    ASSERT_EQ(mFlinger.scheduler()->leaderDisplayId(), innerDisplay->getPhysicalId());
+
+    // ...and should still be after powering on.
+    mFlinger.setPowerModeInternal(innerDisplay, PowerMode::ON);
+    ASSERT_EQ(mFlinger.scheduler()->leaderDisplayId(), innerDisplay->getPhysicalId());
+
+    // The outer display should become the leader after folding.
+    mFlinger.setPowerModeInternal(innerDisplay, PowerMode::OFF);
+    mFlinger.setPowerModeInternal(outerDisplay, PowerMode::ON);
+    ASSERT_EQ(mFlinger.scheduler()->leaderDisplayId(), outerDisplay->getPhysicalId());
+
+    // The inner display should become the leader after unfolding.
+    mFlinger.setPowerModeInternal(outerDisplay, PowerMode::OFF);
+    mFlinger.setPowerModeInternal(innerDisplay, PowerMode::ON);
+    ASSERT_EQ(mFlinger.scheduler()->leaderDisplayId(), innerDisplay->getPhysicalId());
+
+    // The inner display should stay the leader if both are powered on.
+    // TODO(b/256196556): The leader should depend on the displays' VSYNC phases.
+    mFlinger.setPowerModeInternal(outerDisplay, PowerMode::ON);
+    ASSERT_EQ(mFlinger.scheduler()->leaderDisplayId(), innerDisplay->getPhysicalId());
+
+    // The outer display should become the leader if designated.
+    mFlinger.scheduler()->setLeaderDisplay(outerDisplay->getPhysicalId());
+    ASSERT_EQ(mFlinger.scheduler()->leaderDisplayId(), outerDisplay->getPhysicalId());
+}
+
+} // namespace
+} // namespace android
diff --git a/services/surfaceflinger/tests/unittests/SurfaceFlinger_SetPowerModeInternalTest.cpp b/services/surfaceflinger/tests/unittests/SurfaceFlinger_SetPowerModeInternalTest.cpp
index a0aaa68..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);
     }
 };
@@ -484,38 +471,5 @@
     transitionDisplayCommon<ExternalDisplayPowerCase<TransitionOnToUnknownVariant>>();
 }
 
-// TODO(b/262417075)
-TEST_F(SetPowerModeInternalTest, DISABLED_designatesLeaderDisplay) {
-    using Case = SimplePrimaryDisplayCase;
-
-    // --------------------------------------------------------------------
-    // Preconditions
-
-    // Inject a primary display with uninitialized power mode.
-    constexpr bool kInitPowerMode = false;
-    Case::Display::injectHwcDisplay<kInitPowerMode>(this);
-    auto injector = Case::Display::makeFakeExistingDisplayInjector(this);
-    injector.setPowerMode(std::nullopt);
-    const auto display = injector.inject();
-
-    // --------------------------------------------------------------------
-    // Invocation
-
-    // FakeDisplayDeviceInjector registers the display with Scheduler, so it has already been
-    // designated as the leader. Set an arbitrary leader to verify that `setPowerModeInternal`
-    // designates a leader regardless of any preceding `Scheduler::registerDisplay` call(s).
-    constexpr PhysicalDisplayId kPlaceholderId = PhysicalDisplayId::fromPort(42);
-    ASSERT_NE(display->getPhysicalId(), kPlaceholderId);
-    mFlinger.scheduler()->setLeaderDisplay(kPlaceholderId);
-
-    mFlinger.setPowerModeInternal(display, PowerMode::ON);
-
-    // --------------------------------------------------------------------
-    // Postconditions
-
-    // The primary display should be designated as the leader.
-    EXPECT_EQ(mFlinger.scheduler()->leaderDisplayId(), display->getPhysicalId());
-}
-
 } // namespace
 } // namespace android
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/VsyncScheduleTest.cpp b/services/surfaceflinger/tests/unittests/VsyncScheduleTest.cpp
new file mode 100644
index 0000000..652d313
--- /dev/null
+++ b/services/surfaceflinger/tests/unittests/VsyncScheduleTest.cpp
@@ -0,0 +1,215 @@
+/*
+ * Copyright 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#undef LOG_TAG
+#define LOG_TAG "LibSurfaceFlingerUnittests"
+
+#include <ftl/fake_guard.h>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <log/log.h>
+
+#include <scheduler/Fps.h>
+#include "Scheduler/VsyncSchedule.h"
+#include "ThreadContext.h"
+#include "mock/MockSchedulerCallback.h"
+#include "mock/MockVSyncDispatch.h"
+#include "mock/MockVSyncTracker.h"
+#include "mock/MockVsyncController.h"
+
+using testing::_;
+
+namespace android {
+
+class VsyncScheduleTest : public testing::Test {
+protected:
+    VsyncScheduleTest();
+    ~VsyncScheduleTest() override;
+
+    scheduler::mock::SchedulerCallback mCallback;
+    const std::unique_ptr<scheduler::VsyncSchedule> mVsyncSchedule =
+            std::unique_ptr<scheduler::VsyncSchedule>(
+                    new scheduler::VsyncSchedule(std::make_unique<mock::VSyncTracker>(),
+                                                 std::make_unique<mock::VSyncDispatch>(),
+                                                 std::make_unique<mock::VsyncController>()));
+
+    mock::VsyncController& getController() {
+        return *static_cast<mock::VsyncController*>(&mVsyncSchedule->getController());
+    }
+};
+
+VsyncScheduleTest::VsyncScheduleTest() {
+    const ::testing::TestInfo* const test_info =
+            ::testing::UnitTest::GetInstance()->current_test_info();
+    ALOGD("**** Setting up for %s.%s\n", test_info->test_case_name(), test_info->name());
+}
+
+VsyncScheduleTest::~VsyncScheduleTest() {
+    const ::testing::TestInfo* const test_info =
+            ::testing::UnitTest::GetInstance()->current_test_info();
+    ALOGD("**** Tearing down after %s.%s\n", test_info->test_case_name(), test_info->name());
+}
+
+namespace {
+
+using namespace testing;
+
+TEST_F(VsyncScheduleTest, InitiallyDisallowed) {
+    ASSERT_FALSE(mVsyncSchedule->isHardwareVsyncAllowed(false /* makeAllowed */));
+}
+
+TEST_F(VsyncScheduleTest, EnableDoesNothingWhenDisallowed) {
+    EXPECT_CALL(mCallback, setVsyncEnabled(_)).Times(0);
+
+    mVsyncSchedule->enableHardwareVsync(mCallback);
+}
+
+TEST_F(VsyncScheduleTest, DisableDoesNothingWhenDisallowed) {
+    EXPECT_CALL(mCallback, setVsyncEnabled(_)).Times(0);
+
+    mVsyncSchedule->disableHardwareVsync(mCallback, false /* disallow */);
+}
+
+TEST_F(VsyncScheduleTest, MakeAllowed) {
+    ASSERT_TRUE(mVsyncSchedule->isHardwareVsyncAllowed(true /* makeAllowed */));
+}
+
+TEST_F(VsyncScheduleTest, DisableDoesNothingWhenDisabled) {
+    ASSERT_TRUE(mVsyncSchedule->isHardwareVsyncAllowed(true /* makeAllowed */));
+    EXPECT_CALL(mCallback, setVsyncEnabled(_)).Times(0);
+
+    mVsyncSchedule->disableHardwareVsync(mCallback, false /* disallow */);
+}
+
+TEST_F(VsyncScheduleTest, EnableWorksWhenDisabled) {
+    ASSERT_TRUE(mVsyncSchedule->isHardwareVsyncAllowed(true /* makeAllowed */));
+    EXPECT_CALL(mCallback, setVsyncEnabled(true));
+
+    mVsyncSchedule->enableHardwareVsync(mCallback);
+}
+
+TEST_F(VsyncScheduleTest, EnableWorksOnce) {
+    ASSERT_TRUE(mVsyncSchedule->isHardwareVsyncAllowed(true /* makeAllowed */));
+    EXPECT_CALL(mCallback, setVsyncEnabled(true));
+
+    mVsyncSchedule->enableHardwareVsync(mCallback);
+
+    EXPECT_CALL(mCallback, setVsyncEnabled(_)).Times(0);
+    mVsyncSchedule->enableHardwareVsync(mCallback);
+}
+
+TEST_F(VsyncScheduleTest, AllowedIsSticky) {
+    ASSERT_TRUE(mVsyncSchedule->isHardwareVsyncAllowed(true /* makeAllowed */));
+    ASSERT_TRUE(mVsyncSchedule->isHardwareVsyncAllowed(false /* makeAllowed */));
+}
+
+TEST_F(VsyncScheduleTest, EnableDisable) {
+    ASSERT_TRUE(mVsyncSchedule->isHardwareVsyncAllowed(true /* makeAllowed */));
+    EXPECT_CALL(mCallback, setVsyncEnabled(true));
+
+    mVsyncSchedule->enableHardwareVsync(mCallback);
+
+    EXPECT_CALL(mCallback, setVsyncEnabled(false));
+    mVsyncSchedule->disableHardwareVsync(mCallback, false /* disallow */);
+}
+
+TEST_F(VsyncScheduleTest, StartPeriodTransition) {
+    // Note: startPeriodTransition is only called when hardware vsyncs are
+    // allowed.
+    ASSERT_TRUE(mVsyncSchedule->isHardwareVsyncAllowed(true /* makeAllowed */));
+
+    const Period period = (60_Hz).getPeriod();
+
+    EXPECT_CALL(mCallback, setVsyncEnabled(true));
+    EXPECT_CALL(getController(), startPeriodTransition(period.ns()));
+
+    mVsyncSchedule->startPeriodTransition(mCallback, period);
+}
+
+TEST_F(VsyncScheduleTest, StartPeriodTransitionAlreadyEnabled) {
+    ASSERT_TRUE(mVsyncSchedule->isHardwareVsyncAllowed(true /* makeAllowed */));
+    mVsyncSchedule->enableHardwareVsync(mCallback);
+
+    const Period period = (60_Hz).getPeriod();
+
+    EXPECT_CALL(mCallback, setVsyncEnabled(_)).Times(0);
+    EXPECT_CALL(getController(), startPeriodTransition(period.ns()));
+
+    mVsyncSchedule->startPeriodTransition(mCallback, period);
+}
+
+TEST_F(VsyncScheduleTest, AddResyncSampleDisallowed) {
+    const Period period = (60_Hz).getPeriod();
+    const auto timestamp = TimePoint::now();
+
+    EXPECT_CALL(mCallback, setVsyncEnabled(_)).Times(0);
+    EXPECT_CALL(getController(), addHwVsyncTimestamp(_, _, _)).Times(0);
+
+    mVsyncSchedule->addResyncSample(mCallback, timestamp, period);
+}
+
+TEST_F(VsyncScheduleTest, AddResyncSampleDisabled) {
+    ASSERT_TRUE(mVsyncSchedule->isHardwareVsyncAllowed(true /* makeAllowed */));
+    const Period period = (60_Hz).getPeriod();
+    const auto timestamp = TimePoint::now();
+
+    EXPECT_CALL(mCallback, setVsyncEnabled(_)).Times(0);
+    EXPECT_CALL(getController(), addHwVsyncTimestamp(_, _, _)).Times(0);
+
+    mVsyncSchedule->addResyncSample(mCallback, timestamp, period);
+}
+
+TEST_F(VsyncScheduleTest, AddResyncSampleReturnsTrue) {
+    ASSERT_TRUE(mVsyncSchedule->isHardwareVsyncAllowed(true /* makeAllowed */));
+    mVsyncSchedule->enableHardwareVsync(mCallback);
+
+    const Period period = (60_Hz).getPeriod();
+    const auto timestamp = TimePoint::now();
+
+    EXPECT_CALL(mCallback, setVsyncEnabled(_)).Times(0);
+    EXPECT_CALL(getController(),
+                addHwVsyncTimestamp(timestamp.ns(), std::optional<nsecs_t>(period.ns()), _))
+            .WillOnce(Return(true));
+
+    mVsyncSchedule->addResyncSample(mCallback, timestamp, period);
+}
+
+TEST_F(VsyncScheduleTest, AddResyncSampleReturnsFalse) {
+    ASSERT_TRUE(mVsyncSchedule->isHardwareVsyncAllowed(true /* makeAllowed */));
+    mVsyncSchedule->enableHardwareVsync(mCallback);
+
+    const Period period = (60_Hz).getPeriod();
+    const auto timestamp = TimePoint::now();
+
+    EXPECT_CALL(mCallback, setVsyncEnabled(false));
+    EXPECT_CALL(getController(),
+                addHwVsyncTimestamp(timestamp.ns(), std::optional<nsecs_t>(period.ns()), _))
+            .WillOnce(Return(false));
+
+    mVsyncSchedule->addResyncSample(mCallback, timestamp, period);
+}
+
+TEST_F(VsyncScheduleTest, PendingState) FTL_FAKE_GUARD(kMainThreadContext) {
+    ASSERT_FALSE(mVsyncSchedule->getPendingHardwareVsyncState());
+    mVsyncSchedule->setPendingHardwareVsyncState(true);
+    ASSERT_TRUE(mVsyncSchedule->getPendingHardwareVsyncState());
+
+    mVsyncSchedule->setPendingHardwareVsyncState(false);
+    ASSERT_FALSE(mVsyncSchedule->getPendingHardwareVsyncState());
+}
+
+} // namespace
+} // namespace android
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,
diff --git a/services/surfaceflinger/tests/unittests/mock/MockSchedulerCallback.h b/services/surfaceflinger/tests/unittests/mock/MockSchedulerCallback.h
index 7d4b159..103beb5 100644
--- a/services/surfaceflinger/tests/unittests/mock/MockSchedulerCallback.h
+++ b/services/surfaceflinger/tests/unittests/mock/MockSchedulerCallback.h
@@ -18,7 +18,7 @@
 
 #include <gmock/gmock.h>
 
-#include "Scheduler/Scheduler.h"
+#include "Scheduler/ISchedulerCallback.h"
 
 namespace android::scheduler::mock {