diff --git a/services/surfaceflinger/tests/unittests/DisplayModeControllerTest.cpp b/services/surfaceflinger/tests/unittests/DisplayModeControllerTest.cpp
index d971150..29a1fab 100644
--- a/services/surfaceflinger/tests/unittests/DisplayModeControllerTest.cpp
+++ b/services/surfaceflinger/tests/unittests/DisplayModeControllerTest.cpp
@@ -20,6 +20,7 @@
 #include "Display/DisplayModeController.h"
 #include "Display/DisplaySnapshot.h"
 #include "DisplayHardware/HWComposer.h"
+#include "DisplayHardware/Hal.h"
 #include "DisplayIdentificationTestHelpers.h"
 #include "FpsOps.h"
 #include "mock/DisplayHardware/MockComposer.h"
@@ -103,7 +104,7 @@
 
         EXPECT_CALL(*mComposerHal,
                     setActiveConfigWithConstraints(kHwcDisplayId, hwcModeId, constraints, _))
-                .WillOnce(DoAll(SetArgPointee<3>(timeline), Return(hal::V2_4::Error::NONE)));
+                .WillOnce(DoAll(SetArgPointee<3>(timeline), Return(hal::Error::NONE)));
 
         return constraints;
     }
@@ -183,7 +184,8 @@
     hal::VsyncPeriodChangeTimeline timeline;
     const auto constraints = expectModeSet(modeRequest, timeline);
 
-    EXPECT_TRUE(mDmc.initiateModeChange(mDisplayId, std::move(modeRequest), constraints, timeline));
+    EXPECT_EQ(DisplayModeController::ModeChangeResult::Changed,
+              mDmc.initiateModeChange(mDisplayId, std::move(modeRequest), constraints, timeline));
     EXPECT_DISPLAY_MODE_REQUEST(kDesiredMode90, mDmc.getPendingMode(mDisplayId));
 
     mDmc.clearDesiredMode(mDisplayId);
@@ -210,7 +212,8 @@
     hal::VsyncPeriodChangeTimeline timeline;
     auto constraints = expectModeSet(modeRequest, timeline);
 
-    EXPECT_TRUE(mDmc.initiateModeChange(mDisplayId, std::move(modeRequest), constraints, timeline));
+    EXPECT_EQ(DisplayModeController::ModeChangeResult::Changed,
+              mDmc.initiateModeChange(mDisplayId, std::move(modeRequest), constraints, timeline));
     EXPECT_DISPLAY_MODE_REQUEST(kDesiredMode90, mDmc.getPendingMode(mDisplayId));
 
     // No action since a mode switch has already been initiated.
@@ -223,7 +226,8 @@
     constexpr bool kSubsequent = true;
     constraints = expectModeSet(modeRequest, timeline, kSubsequent);
 
-    EXPECT_TRUE(mDmc.initiateModeChange(mDisplayId, std::move(modeRequest), constraints, timeline));
+    EXPECT_EQ(DisplayModeController::ModeChangeResult::Changed,
+              mDmc.initiateModeChange(mDisplayId, std::move(modeRequest), constraints, timeline));
     EXPECT_DISPLAY_MODE_REQUEST(kDesiredMode120, mDmc.getPendingMode(mDisplayId));
 
     mDmc.clearDesiredMode(mDisplayId);
diff --git a/services/surfaceflinger/tests/unittests/HWComposerTest.cpp b/services/surfaceflinger/tests/unittests/HWComposerTest.cpp
index e0753a3..30bce2e 100644
--- a/services/surfaceflinger/tests/unittests/HWComposerTest.cpp
+++ b/services/surfaceflinger/tests/unittests/HWComposerTest.cpp
@@ -69,7 +69,7 @@
 using ::testing::StrictMock;
 
 struct HWComposerTest : testing::Test {
-    using HalError = hardware::graphics::composer::V2_1::Error;
+    using HalError = hal::Error;
 
     Hwc2::mock::Composer* const mHal = new StrictMock<Hwc2::mock::Composer>();
     impl::HWComposer mHwc{std::unique_ptr<Hwc2::Composer>(mHal)};
diff --git a/services/surfaceflinger/tests/unittests/SurfaceFlinger_DisplayModeSwitching.cpp b/services/surfaceflinger/tests/unittests/SurfaceFlinger_DisplayModeSwitching.cpp
index 8699621..b0dd5c2 100644
--- a/services/surfaceflinger/tests/unittests/SurfaceFlinger_DisplayModeSwitching.cpp
+++ b/services/surfaceflinger/tests/unittests/SurfaceFlinger_DisplayModeSwitching.cpp
@@ -34,7 +34,7 @@
                                                static_cast<hal::HWConfigId>(        \
                                                        ftl::to_underlying(modeId)), \
                                                _, _))                               \
-            .WillOnce(DoAll(SetArgPointee<3>(timeline), Return(Error::NONE)))
+            .WillOnce(DoAll(SetArgPointee<3>(timeline), Return(hal::Error::NONE)))
 
 namespace android {
 namespace {
diff --git a/services/surfaceflinger/tests/unittests/SurfaceFlinger_NotifyExpectedPresentTest.cpp b/services/surfaceflinger/tests/unittests/SurfaceFlinger_NotifyExpectedPresentTest.cpp
index 20a3315..6cc6322 100644
--- a/services/surfaceflinger/tests/unittests/SurfaceFlinger_NotifyExpectedPresentTest.cpp
+++ b/services/surfaceflinger/tests/unittests/SurfaceFlinger_NotifyExpectedPresentTest.cpp
@@ -18,12 +18,13 @@
 #define LOG_TAG "LibSurfaceFlingerUnittests"
 
 #include <gui/SurfaceComposerClient.h>
+#include "DisplayHardware/Hal.h"
 #include "DisplayTransactionTestHelpers.h"
 
 namespace android {
 
 using FakeHwcDisplayInjector = TestableSurfaceFlinger::FakeHwcDisplayInjector;
-using android::hardware::graphics::composer::V2_1::Error;
+using android::hardware::graphics::composer::hal::Error;
 
 class NotifyExpectedPresentTest : public DisplayTransactionTest {
 public:
diff --git a/services/surfaceflinger/tests/unittests/SurfaceFlinger_PowerHintTest.cpp b/services/surfaceflinger/tests/unittests/SurfaceFlinger_PowerHintTest.cpp
index c3934e6..3ae5ed9 100644
--- a/services/surfaceflinger/tests/unittests/SurfaceFlinger_PowerHintTest.cpp
+++ b/services/surfaceflinger/tests/unittests/SurfaceFlinger_PowerHintTest.cpp
@@ -21,6 +21,8 @@
 
 #include "CommitAndCompositeTest.h"
 
+#include "DisplayHardware/Hal.h"
+
 using namespace std::chrono_literals;
 using testing::_;
 using testing::Return;
@@ -40,7 +42,7 @@
     EXPECT_CALL(*mComposer, presentOrValidateDisplay(HWC_DISPLAY, _, _, _, _, _, _)).WillOnce([] {
         constexpr Duration kMockHwcRunTime = 20ms;
         std::this_thread::sleep_for(kMockHwcRunTime);
-        return hardware::graphics::composer::V2_1::Error::NONE;
+        return hardware::graphics::composer::hal::Error::NONE;
     });
     EXPECT_CALL(*mPowerAdvisor, reportActualWorkDuration()).Times(1);
 
@@ -61,7 +63,7 @@
     EXPECT_CALL(*mComposer, presentOrValidateDisplay(HWC_DISPLAY, _, _, _, _, _, _)).WillOnce([] {
         constexpr Duration kMockHwcRunTime = 20ms;
         std::this_thread::sleep_for(kMockHwcRunTime);
-        return hardware::graphics::composer::V2_1::Error::NONE;
+        return hardware::graphics::composer::hal::Error::NONE;
     });
     EXPECT_CALL(*mPowerAdvisor, reportActualWorkDuration()).Times(0);
 
diff --git a/services/surfaceflinger/tests/unittests/mock/DisplayHardware/MockComposer.h b/services/surfaceflinger/tests/unittests/mock/DisplayHardware/MockComposer.h
index 88052db..0d5266e 100644
--- a/services/surfaceflinger/tests/unittests/mock/DisplayHardware/MockComposer.h
+++ b/services/surfaceflinger/tests/unittests/mock/DisplayHardware/MockComposer.h
@@ -20,6 +20,7 @@
 
 #include "DisplayHardware/ComposerHal.h"
 #include "DisplayHardware/HWC2.h"
+#include "DisplayHardware/Hal.h"
 
 namespace android {
 
@@ -34,9 +35,9 @@
 using android::hardware::graphics::common::V1_2::Dataspace;
 using android::hardware::graphics::common::V1_2::PixelFormat;
 
+using android::hardware::graphics::composer::hal::Error;
 using android::hardware::graphics::composer::V2_1::Config;
 using android::hardware::graphics::composer::V2_1::Display;
-using android::hardware::graphics::composer::V2_1::Error;
 using android::hardware::graphics::composer::V2_1::IComposer;
 using android::hardware::graphics::composer::V2_1::Layer;
 using android::hardware::graphics::composer::V2_4::IComposerCallback;
@@ -142,8 +143,8 @@
                  V2_4::Error(Display, Config, std::vector<VsyncPeriodNanos>*));
     MOCK_METHOD2(getDisplayVsyncPeriod, V2_4::Error(Display, VsyncPeriodNanos*));
     MOCK_METHOD4(setActiveConfigWithConstraints,
-                 V2_4::Error(Display, Config, const IComposerClient::VsyncPeriodChangeConstraints&,
-                             VsyncPeriodChangeTimeline*));
+                 Error(Display, Config, const IComposerClient::VsyncPeriodChangeConstraints&,
+                       VsyncPeriodChangeTimeline*));
     MOCK_METHOD2(setAutoLowLatencyMode, V2_4::Error(Display, bool));
     MOCK_METHOD2(setBootDisplayConfig, Error(Display, Config));
     MOCK_METHOD1(clearBootDisplayConfig, Error(Display));
diff --git a/services/surfaceflinger/tests/unittests/mock/DisplayHardware/MockHWC2.h b/services/surfaceflinger/tests/unittests/mock/DisplayHardware/MockHWC2.h
index fa74492..ec065a7 100644
--- a/services/surfaceflinger/tests/unittests/mock/DisplayHardware/MockHWC2.h
+++ b/services/surfaceflinger/tests/unittests/mock/DisplayHardware/MockHWC2.h
@@ -17,6 +17,7 @@
 #pragma once
 
 #include <gmock/gmock.h>
+#include <cstdint>
 
 #include "DisplayHardware/HWC2.h"
 
@@ -85,8 +86,8 @@
     MOCK_METHOD(ftl::Future<hal::Error>, setDisplayBrightness,
                 (float, float, const Hwc2::Composer::DisplayBrightnessOptions &), (override));
     MOCK_METHOD(hal::Error, setActiveConfigWithConstraints,
-                (hal::HWConfigId, const hal::VsyncPeriodChangeConstraints &,
-                 hal::VsyncPeriodChangeTimeline *),
+                (hal::HWConfigId, const hal::VsyncPeriodChangeConstraints&,
+                 hal::VsyncPeriodChangeTimeline*),
                 (override));
     MOCK_METHOD(hal::Error, setBootDisplayConfig, (hal::HWConfigId), (override));
     MOCK_METHOD(hal::Error, clearBootDisplayConfig, (), (override));