diff --git a/services/surfaceflinger/CompositionEngine/tests/MockHWComposer.h b/services/surfaceflinger/CompositionEngine/tests/MockHWComposer.h
index 3ca13a6..64cbea9 100644
--- a/services/surfaceflinger/CompositionEngine/tests/MockHWComposer.h
+++ b/services/surfaceflinger/CompositionEngine/tests/MockHWComposer.h
@@ -39,7 +39,7 @@
     HWComposer();
     ~HWComposer() override;
 
-    MOCK_METHOD2(setConfiguration, void(HWC2::ComposerCallback*, int32_t));
+    MOCK_METHOD1(setCallback, void(HWC2::ComposerCallback*));
     MOCK_CONST_METHOD3(getDisplayIdentificationData,
                        bool(hal::HWDisplayId, uint8_t*, DisplayIdentificationData*));
     MOCK_CONST_METHOD1(hasCapability, bool(hal::Capability));
diff --git a/services/surfaceflinger/DisplayHardware/HWC2.h b/services/surfaceflinger/DisplayHardware/HWC2.h
index fae95e7..871465d 100644
--- a/services/surfaceflinger/DisplayHardware/HWC2.h
+++ b/services/surfaceflinger/DisplayHardware/HWC2.h
@@ -56,20 +56,16 @@
 // Implement this interface to receive hardware composer events.
 //
 // These callback functions will generally be called on a hwbinder thread, but
-// when first registering the callback the onHotplugReceived() function will
+// when first registering the callback the onComposerHalHotplug() function will
 // immediately be called on the thread calling registerCallback().
-//
-// All calls receive a sequenceId, which will be the value that was supplied to
-// HWC2::Device::registerCallback(). It's used to help differentiate callbacks
-// from different hardware composer instances.
 struct ComposerCallback {
-    virtual void onHotplugReceived(int32_t sequenceId, hal::HWDisplayId, hal::Connection) = 0;
-    virtual void onRefreshReceived(int32_t sequenceId, hal::HWDisplayId) = 0;
-    virtual void onVsyncReceived(int32_t sequenceId, hal::HWDisplayId, int64_t timestamp,
-                                 std::optional<hal::VsyncPeriodNanos>) = 0;
-    virtual void onVsyncPeriodTimingChangedReceived(int32_t sequenceId, hal::HWDisplayId,
-                                                    const hal::VsyncPeriodChangeTimeline&) = 0;
-    virtual void onSeamlessPossible(int32_t sequenceId, hal::HWDisplayId) = 0;
+    virtual void onComposerHalHotplug(hal::HWDisplayId, hal::Connection) = 0;
+    virtual void onComposerHalRefresh(hal::HWDisplayId) = 0;
+    virtual void onComposerHalVsync(hal::HWDisplayId, int64_t timestamp,
+                                    std::optional<hal::VsyncPeriodNanos>) = 0;
+    virtual void onComposerHalVsyncPeriodTimingChanged(hal::HWDisplayId,
+                                                       const hal::VsyncPeriodChangeTimeline&) = 0;
+    virtual void onComposerHalSeamlessPossible(hal::HWDisplayId) = 0;
 
 protected:
     ~ComposerCallback() = default;
diff --git a/services/surfaceflinger/DisplayHardware/HWComposer.cpp b/services/surfaceflinger/DisplayHardware/HWComposer.cpp
index b7bb924..32f04e5 100644
--- a/services/surfaceflinger/DisplayHardware/HWComposer.cpp
+++ b/services/surfaceflinger/DisplayHardware/HWComposer.cpp
@@ -82,25 +82,22 @@
 
 class ComposerCallbackBridge : public hal::IComposerCallback {
 public:
-    ComposerCallbackBridge(ComposerCallback* callback, int32_t sequenceId,
-                           bool vsyncSwitchingSupported)
-          : mCallback(callback),
-            mSequenceId(sequenceId),
-            mVsyncSwitchingSupported(vsyncSwitchingSupported) {}
+    ComposerCallbackBridge(ComposerCallback* callback, bool vsyncSwitchingSupported)
+          : mCallback(callback), mVsyncSwitchingSupported(vsyncSwitchingSupported) {}
 
-    Return<void> onHotplug(hal::HWDisplayId display, hal::Connection conn) override {
-        mCallback->onHotplugReceived(mSequenceId, display, conn);
+    Return<void> onHotplug(hal::HWDisplayId display, hal::Connection connection) override {
+        mCallback->onComposerHalHotplug(display, connection);
         return Void();
     }
 
     Return<void> onRefresh(hal::HWDisplayId display) override {
-        mCallback->onRefreshReceived(mSequenceId, display);
+        mCallback->onComposerHalRefresh(display);
         return Void();
     }
 
     Return<void> onVsync(hal::HWDisplayId display, int64_t timestamp) override {
         if (!mVsyncSwitchingSupported) {
-            mCallback->onVsyncReceived(mSequenceId, display, timestamp, std::nullopt);
+            mCallback->onComposerHalVsync(display, timestamp, std::nullopt);
         } else {
             ALOGW("Unexpected onVsync callback on composer >= 2.4, ignoring.");
         }
@@ -110,8 +107,7 @@
     Return<void> onVsync_2_4(hal::HWDisplayId display, int64_t timestamp,
                              hal::VsyncPeriodNanos vsyncPeriodNanos) override {
         if (mVsyncSwitchingSupported) {
-            mCallback->onVsyncReceived(mSequenceId, display, timestamp,
-                                       std::make_optional(vsyncPeriodNanos));
+            mCallback->onComposerHalVsync(display, timestamp, vsyncPeriodNanos);
         } else {
             ALOGW("Unexpected onVsync_2_4 callback on composer <= 2.3, ignoring.");
         }
@@ -119,20 +115,18 @@
     }
 
     Return<void> onVsyncPeriodTimingChanged(
-            hal::HWDisplayId display,
-            const hal::VsyncPeriodChangeTimeline& updatedTimeline) override {
-        mCallback->onVsyncPeriodTimingChangedReceived(mSequenceId, display, updatedTimeline);
+            hal::HWDisplayId display, const hal::VsyncPeriodChangeTimeline& timeline) override {
+        mCallback->onComposerHalVsyncPeriodTimingChanged(display, timeline);
         return Void();
     }
 
     Return<void> onSeamlessPossible(hal::HWDisplayId display) override {
-        mCallback->onSeamlessPossible(mSequenceId, display);
+        mCallback->onComposerHalSeamlessPossible(display);
         return Void();
     }
 
 private:
-    ComposerCallback* mCallback;
-    const int32_t mSequenceId;
+    ComposerCallback* const mCallback;
     const bool mVsyncSwitchingSupported;
 };
 
@@ -155,7 +149,7 @@
     mDisplayData.clear();
 }
 
-void HWComposer::setConfiguration(HWC2::ComposerCallback* callback, int32_t sequenceId) {
+void HWComposer::setCallback(HWC2::ComposerCallback* callback) {
     loadCapabilities();
     loadLayerMetadataSupport();
 
@@ -164,10 +158,9 @@
         return;
     }
     mRegisteredCallback = true;
-    sp<ComposerCallbackBridge> callbackBridge(
-            new ComposerCallbackBridge(callback, sequenceId,
-                                       mComposer->isVsyncPeriodSwitchSupported()));
-    mComposer->registerCallback(callbackBridge);
+
+    mComposer->registerCallback(
+            sp<ComposerCallbackBridge>::make(callback, mComposer->isVsyncPeriodSwitchSupported()));
 }
 
 bool HWComposer::getDisplayIdentificationData(hal::HWDisplayId hwcDisplayId, uint8_t* outPort,
diff --git a/services/surfaceflinger/DisplayHardware/HWComposer.h b/services/surfaceflinger/DisplayHardware/HWComposer.h
index 3ddcdd8..cd6f9f5 100644
--- a/services/surfaceflinger/DisplayHardware/HWComposer.h
+++ b/services/surfaceflinger/DisplayHardware/HWComposer.h
@@ -100,7 +100,7 @@
 
     virtual ~HWComposer();
 
-    virtual void setConfiguration(HWC2::ComposerCallback* callback, int32_t sequenceId) = 0;
+    virtual void setCallback(HWC2::ComposerCallback*) = 0;
 
     virtual bool getDisplayIdentificationData(hal::HWDisplayId, uint8_t* outPort,
                                               DisplayIdentificationData* outData) const = 0;
@@ -252,7 +252,7 @@
 
     ~HWComposer() override;
 
-    void setConfiguration(HWC2::ComposerCallback* callback, int32_t sequenceId) override;
+    void setCallback(HWC2::ComposerCallback*) override;
 
     bool getDisplayIdentificationData(hal::HWDisplayId, uint8_t* outPort,
                                       DisplayIdentificationData* outData) const override;
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 1deda9b..2b4f9ef 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -783,7 +783,7 @@
                     .build()));
     mCompositionEngine->setTimeStats(mTimeStats);
     mCompositionEngine->setHwComposer(getFactory().createHWComposer(mHwcServiceName));
-    mCompositionEngine->getHwComposer().setConfiguration(this, getBE().mComposerSequenceId);
+    mCompositionEngine->getHwComposer().setCallback(this);
     ClientCache::getInstance().setRenderEngine(&getRenderEngine());
 
     if (base::GetBoolProperty("debug.sf.enable_hwc_vds"s, false)) {
@@ -1663,16 +1663,11 @@
     return 0;
 }
 
-void SurfaceFlinger::onVsyncReceived(int32_t sequenceId, hal::HWDisplayId hwcDisplayId,
-                                     int64_t timestamp,
-                                     std::optional<hal::VsyncPeriodNanos> vsyncPeriod) {
-    ATRACE_NAME("SF onVsync");
+void SurfaceFlinger::onComposerHalVsync(hal::HWDisplayId hwcDisplayId, int64_t timestamp,
+                                        std::optional<hal::VsyncPeriodNanos> vsyncPeriod) {
+    ATRACE_CALL();
 
     Mutex::Autolock lock(mStateLock);
-    // Ignore any vsyncs from a previous hardware composer.
-    if (sequenceId != getBE().mComposerSequenceId) {
-        return;
-    }
 
     if (const auto displayId = getHwComposer().toPhysicalDisplayId(hwcDisplayId)) {
         auto token = getPhysicalDisplayTokenLocked(*displayId);
@@ -1723,16 +1718,11 @@
     setDesiredActiveMode({refreshRate.getModeId(), event});
 }
 
-void SurfaceFlinger::onHotplugReceived(int32_t sequenceId, hal::HWDisplayId hwcDisplayId,
-                                       hal::Connection connection) {
-    ALOGI("%s(%d, %" PRIu64 ", %s)", __FUNCTION__, sequenceId, hwcDisplayId,
+void SurfaceFlinger::onComposerHalHotplug(hal::HWDisplayId hwcDisplayId,
+                                          hal::Connection connection) {
+    ALOGI("%s(%" PRIu64 ", %s)", __func__, hwcDisplayId,
           connection == hal::Connection::CONNECTED ? "connected" : "disconnected");
 
-    // Ignore events that do not have the right sequenceId.
-    if (sequenceId != getBE().mComposerSequenceId) {
-        return;
-    }
-
     // Only lock if we're not on the main thread. This function is normally
     // called on a hwbinder thread, but for the primary display it's called on
     // the main thread with the state lock already held, so don't attempt to
@@ -1749,26 +1739,19 @@
     setTransactionFlags(eDisplayTransactionNeeded);
 }
 
-void SurfaceFlinger::onVsyncPeriodTimingChangedReceived(
-        int32_t sequenceId, hal::HWDisplayId /*display*/,
-        const hal::VsyncPeriodChangeTimeline& updatedTimeline) {
+void SurfaceFlinger::onComposerHalVsyncPeriodTimingChanged(
+        hal::HWDisplayId, const hal::VsyncPeriodChangeTimeline& timeline) {
     Mutex::Autolock lock(mStateLock);
-    if (sequenceId != getBE().mComposerSequenceId) {
-        return;
-    }
-    mScheduler->onNewVsyncPeriodChangeTimeline(updatedTimeline);
+    mScheduler->onNewVsyncPeriodChangeTimeline(timeline);
 }
 
-void SurfaceFlinger::onSeamlessPossible(int32_t /*sequenceId*/, hal::HWDisplayId /*display*/) {
+void SurfaceFlinger::onComposerHalSeamlessPossible(hal::HWDisplayId) {
     // TODO(b/142753666): use constraints when calling to setActiveModeWithConstraints and
     // use this callback to know when to retry in case of SEAMLESS_NOT_POSSIBLE.
 }
 
-void SurfaceFlinger::onRefreshReceived(int sequenceId, hal::HWDisplayId /*hwcDisplayId*/) {
+void SurfaceFlinger::onComposerHalRefresh(hal::HWDisplayId) {
     Mutex::Autolock lock(mStateLock);
-    if (sequenceId != getBE().mComposerSequenceId) {
-        return;
-    }
     repaintEverythingForHWC();
 }
 
@@ -5651,7 +5634,7 @@
                     Mutex::Autolock lock(mStateLock);
                     hwcId = getHwComposer().getInternalHwcDisplayId();
                 }
-                onHotplugReceived(getBE().mComposerSequenceId, *hwcId, hal::Connection::CONNECTED);
+                onComposerHalHotplug(*hwcId, hal::Connection::CONNECTED);
                 return NO_ERROR;
             }
             // Modify the max number of display frames stored within FrameTimeline
diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index 5616887..be3417b 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -170,11 +170,6 @@
     };
     mutable Mutex mBufferingStatsMutex;
     std::unordered_map<std::string, BufferingStats> mBufferingStats;
-
-    // The composer sequence id is a monotonically increasing integer that we
-    // use to differentiate callbacks from different hardware composer
-    // instances. Each hardware composer instance gets a different sequence id.
-    int32_t mComposerSequenceId = 0;
 };
 
 class SurfaceFlinger : public BnSurfaceComposer,
@@ -718,18 +713,14 @@
     // Implements RefBase.
     void onFirstRef() override;
 
-    /*
-     * HWC2::ComposerCallback / HWComposer::EventHandler interface
-     */
-    void onVsyncReceived(int32_t sequenceId, hal::HWDisplayId hwcDisplayId, int64_t timestamp,
-                         std::optional<hal::VsyncPeriodNanos> vsyncPeriod) override;
-    void onHotplugReceived(int32_t sequenceId, hal::HWDisplayId hwcDisplayId,
-                           hal::Connection connection) override;
-    void onRefreshReceived(int32_t sequenceId, hal::HWDisplayId hwcDisplayId) override;
-    void onVsyncPeriodTimingChangedReceived(
-            int32_t sequenceId, hal::HWDisplayId display,
-            const hal::VsyncPeriodChangeTimeline& updatedTimeline) override;
-    void onSeamlessPossible(int32_t sequenceId, hal::HWDisplayId display) override;
+    // HWC2::ComposerCallback overrides:
+    void onComposerHalVsync(hal::HWDisplayId, int64_t timestamp,
+                            std::optional<hal::VsyncPeriodNanos>) override;
+    void onComposerHalHotplug(hal::HWDisplayId, hal::Connection) override;
+    void onComposerHalRefresh(hal::HWDisplayId) override;
+    void onComposerHalVsyncPeriodTimingChanged(hal::HWDisplayId,
+                                               const hal::VsyncPeriodChangeTimeline&) override;
+    void onComposerHalSeamlessPossible(hal::HWDisplayId) override;
 
     /*
      * ISchedulerCallback
diff --git a/services/surfaceflinger/tests/unittests/Android.bp b/services/surfaceflinger/tests/unittests/Android.bp
index 736ef30..b5086fa 100644
--- a/services/surfaceflinger/tests/unittests/Android.bp
+++ b/services/surfaceflinger/tests/unittests/Android.bp
@@ -69,7 +69,7 @@
         "SurfaceFlinger_GetDisplayNativePrimariesTest.cpp",
         "SurfaceFlinger_HandleTransactionLockedTest.cpp",
         "SurfaceFlinger_NotifyPowerBoostTest.cpp",
-        "SurfaceFlinger_OnHotplugReceivedTest.cpp",
+        "SurfaceFlinger_HotplugTest.cpp",
         "SurfaceFlinger_OnInitializeDisplaysTest.cpp",
         "SurfaceFlinger_SetDisplayStateTest.cpp",
         "SurfaceFlinger_SetPowerModeInternalTest.cpp",
diff --git a/services/surfaceflinger/tests/unittests/HWComposerTest.cpp b/services/surfaceflinger/tests/unittests/HWComposerTest.cpp
index 57f065a..655baf8 100644
--- a/services/surfaceflinger/tests/unittests/HWComposerTest.cpp
+++ b/services/surfaceflinger/tests/unittests/HWComposerTest.cpp
@@ -58,22 +58,21 @@
 using ::testing::StrictMock;
 
 struct MockHWC2ComposerCallback final : StrictMock<HWC2::ComposerCallback> {
-    MOCK_METHOD3(onHotplugReceived, void(int32_t sequenceId, hal::HWDisplayId, hal::Connection));
-    MOCK_METHOD2(onRefreshReceived, void(int32_t sequenceId, hal::HWDisplayId));
-    MOCK_METHOD4(onVsyncReceived,
-                 void(int32_t sequenceId, hal::HWDisplayId, int64_t timestamp,
-                      std::optional<hal::VsyncPeriodNanos>));
-    MOCK_METHOD3(onVsyncPeriodTimingChangedReceived,
-                 void(int32_t sequenceId, hal::HWDisplayId, const hal::VsyncPeriodChangeTimeline&));
-    MOCK_METHOD2(onSeamlessPossible, void(int32_t sequenceId, hal::HWDisplayId));
+    MOCK_METHOD2(onComposerHalHotplug, void(hal::HWDisplayId, hal::Connection));
+    MOCK_METHOD1(onComposerHalRefresh, void(hal::HWDisplayId));
+    MOCK_METHOD3(onComposerHalVsync,
+                 void(hal::HWDisplayId, int64_t timestamp, std::optional<hal::VsyncPeriodNanos>));
+    MOCK_METHOD2(onComposerHalVsyncPeriodTimingChanged,
+                 void(hal::HWDisplayId, const hal::VsyncPeriodChangeTimeline&));
+    MOCK_METHOD1(onComposerHalSeamlessPossible, void(hal::HWDisplayId));
 };
 
-struct HWComposerSetConfigurationTest : testing::Test {
+struct HWComposerSetCallbackTest : testing::Test {
     Hwc2::mock::Composer* mHal = new StrictMock<Hwc2::mock::Composer>();
     MockHWC2ComposerCallback mCallback;
 };
 
-TEST_F(HWComposerSetConfigurationTest, loadsLayerMetadataSupport) {
+TEST_F(HWComposerSetCallbackTest, loadsLayerMetadataSupport) {
     const std::string kMetadata1Name = "com.example.metadata.1";
     constexpr bool kMetadata1Mandatory = false;
     const std::string kMetadata2Name = "com.example.metadata.2";
@@ -90,7 +89,7 @@
     EXPECT_CALL(*mHal, isVsyncPeriodSwitchSupported()).WillOnce(Return(false));
 
     impl::HWComposer hwc{std::unique_ptr<Hwc2::Composer>(mHal)};
-    hwc.setConfiguration(&mCallback, 123);
+    hwc.setCallback(&mCallback);
 
     const auto& supported = hwc.getSupportedLayerGenericMetadata();
     EXPECT_EQ(2u, supported.size());
@@ -100,7 +99,7 @@
     EXPECT_EQ(kMetadata2Mandatory, supported.find(kMetadata2Name)->second);
 }
 
-TEST_F(HWComposerSetConfigurationTest, handlesUnsupportedCallToGetLayerGenericMetadataKeys) {
+TEST_F(HWComposerSetCallbackTest, handlesUnsupportedCallToGetLayerGenericMetadataKeys) {
     EXPECT_CALL(*mHal, getCapabilities()).WillOnce(Return(std::vector<hal::Capability>{}));
     EXPECT_CALL(*mHal, getLayerGenericMetadataKeys(_))
             .WillOnce(Return(hardware::graphics::composer::V2_4::Error::UNSUPPORTED));
@@ -108,7 +107,7 @@
     EXPECT_CALL(*mHal, isVsyncPeriodSwitchSupported()).WillOnce(Return(false));
 
     impl::HWComposer hwc{std::unique_ptr<Hwc2::Composer>(mHal)};
-    hwc.setConfiguration(&mCallback, 123);
+    hwc.setCallback(&mCallback);
 
     const auto& supported = hwc.getSupportedLayerGenericMetadata();
     EXPECT_EQ(0u, supported.size());
diff --git a/services/surfaceflinger/tests/unittests/SurfaceFlinger_OnHotplugReceivedTest.cpp b/services/surfaceflinger/tests/unittests/SurfaceFlinger_HotplugTest.cpp
similarity index 62%
rename from services/surfaceflinger/tests/unittests/SurfaceFlinger_OnHotplugReceivedTest.cpp
rename to services/surfaceflinger/tests/unittests/SurfaceFlinger_HotplugTest.cpp
index 42f4cf3..bd89397 100644
--- a/services/surfaceflinger/tests/unittests/SurfaceFlinger_OnHotplugReceivedTest.cpp
+++ b/services/surfaceflinger/tests/unittests/SurfaceFlinger_HotplugTest.cpp
@@ -22,19 +22,15 @@
 namespace android {
 namespace {
 
-class OnHotplugReceivedTest : public DisplayTransactionTest {};
+class HotplugTest : public DisplayTransactionTest {};
 
-TEST_F(OnHotplugReceivedTest, hotplugEnqueuesEventsForDisplayTransaction) {
-    constexpr int currentSequenceId = 123;
+TEST_F(HotplugTest, enqueuesEventsForDisplayTransaction) {
     constexpr HWDisplayId hwcDisplayId1 = 456;
     constexpr HWDisplayId hwcDisplayId2 = 654;
 
     // --------------------------------------------------------------------
     // Preconditions
 
-    // Set the current sequence id for accepted events
-    mFlinger.mutableComposerSequenceId() = currentSequenceId;
-
     // Set the main thread id so that the current thread does not appear to be
     // the main thread.
     mFlinger.mutableMainThreadId() = std::thread::id();
@@ -50,8 +46,8 @@
     // Invocation
 
     // Simulate two hotplug events (a connect and a disconnect)
-    mFlinger.onHotplugReceived(currentSequenceId, hwcDisplayId1, Connection::CONNECTED);
-    mFlinger.onHotplugReceived(currentSequenceId, hwcDisplayId2, Connection::DISCONNECTED);
+    mFlinger.onComposerHalHotplug(hwcDisplayId1, Connection::CONNECTED);
+    mFlinger.onComposerHalHotplug(hwcDisplayId2, Connection::DISCONNECTED);
 
     // --------------------------------------------------------------------
     // Postconditions
@@ -68,52 +64,14 @@
     EXPECT_EQ(Connection::DISCONNECTED, pendingEvents[1].connection);
 }
 
-TEST_F(OnHotplugReceivedTest, hotplugDiscardsUnexpectedEvents) {
-    constexpr int currentSequenceId = 123;
-    constexpr int otherSequenceId = 321;
-    constexpr HWDisplayId displayId = 456;
-
-    // --------------------------------------------------------------------
-    // Preconditions
-
-    // Set the current sequence id for accepted events
-    mFlinger.mutableComposerSequenceId() = currentSequenceId;
-
-    // Set the main thread id so that the current thread does not appear to be
-    // the main thread.
-    mFlinger.mutableMainThreadId() = std::thread::id();
-
-    // --------------------------------------------------------------------
-    // Call Expectations
-
-    // We do not expect any calls to invalidate().
-    EXPECT_CALL(*mMessageQueue, invalidate()).Times(0);
-
-    // --------------------------------------------------------------------
-    // Invocation
-
-    // Call with an unexpected sequence id
-    mFlinger.onHotplugReceived(otherSequenceId, displayId, Connection::INVALID);
-
-    // --------------------------------------------------------------------
-    // Postconditions
-
-    // The display transaction needed flag should not be set
-    EXPECT_FALSE(hasTransactionFlagSet(eDisplayTransactionNeeded));
-
-    // There should be no pending events
-    EXPECT_TRUE(mFlinger.mutablePendingHotplugEvents().empty());
-}
-
-TEST_F(OnHotplugReceivedTest, hotplugProcessesEnqueuedEventsIfCalledOnMainThread) {
-    constexpr int currentSequenceId = 123;
+TEST_F(HotplugTest, processesEnqueuedEventsIfCalledOnMainThread) {
     constexpr HWDisplayId displayId1 = 456;
 
     // --------------------------------------------------------------------
     // Note:
     // --------------------------------------------------------------------
     // This test case is a bit tricky. We want to verify that
-    // onHotplugReceived() calls processDisplayHotplugEventsLocked(), but we
+    // onComposerHalHotplug() calls processDisplayHotplugEventsLocked(), but we
     // don't really want to provide coverage for everything the later function
     // does as there are specific tests for it.
     // --------------------------------------------------------------------
@@ -121,9 +79,6 @@
     // --------------------------------------------------------------------
     // Preconditions
 
-    // Set the current sequence id for accepted events
-    mFlinger.mutableComposerSequenceId() = currentSequenceId;
-
     // Set the main thread id so that the current thread does appear to be the
     // main thread.
     mFlinger.mutableMainThreadId() = std::this_thread::get_id();
@@ -139,9 +94,9 @@
     // Invocation
 
     // Simulate a disconnect on a display id that is not connected. This should
-    // be enqueued by onHotplugReceived(), and dequeued by
+    // be enqueued by onComposerHalHotplug(), and dequeued by
     // processDisplayHotplugEventsLocked(), but then ignored as invalid.
-    mFlinger.onHotplugReceived(currentSequenceId, displayId1, Connection::DISCONNECTED);
+    mFlinger.onComposerHalHotplug(displayId1, Connection::DISCONNECTED);
 
     // --------------------------------------------------------------------
     // Postconditions
@@ -155,4 +110,4 @@
 }
 
 } // namespace
-} // namespace android
\ No newline at end of file
+} // namespace android
diff --git a/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h b/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h
index 9b904d3..d78f36c 100644
--- a/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h
+++ b/services/surfaceflinger/tests/unittests/TestableSurfaceFlinger.h
@@ -322,9 +322,8 @@
         return mFlinger->handleTransactionLocked(transactionFlags);
     }
 
-    auto onHotplugReceived(int32_t sequenceId, hal::HWDisplayId display,
-                           hal::Connection connection) {
-        return mFlinger->onHotplugReceived(sequenceId, display, connection);
+    void onComposerHalHotplug(hal::HWDisplayId hwcDisplayId, hal::Connection connection) {
+        mFlinger->onComposerHalHotplug(hwcDisplayId, connection);
     }
 
     auto setDisplayStateLocked(const DisplayState& s) {
@@ -438,7 +437,6 @@
     auto& mutablePowerAdvisor() { return mFlinger->mPowerAdvisor; }
     auto& mutableDebugDisableHWC() { return mFlinger->mDebugDisableHWC; }
 
-    auto& mutableComposerSequenceId() { return mFlinger->getBE().mComposerSequenceId; }
     auto& mutableHwcDisplayData() { return getHwComposer().mDisplayData; }
     auto& mutableHwcPhysicalDisplayIdMap() { return getHwComposer().mPhysicalDisplayIdMap; }
     auto& mutableInternalHwcDisplayId() { return getHwComposer().mInternalHwcDisplayId; }