diff --git a/packages/SystemUI/src/com/android/systemui/dagger/ReferenceSystemUIModule.java b/packages/SystemUI/src/com/android/systemui/dagger/ReferenceSystemUIModule.java
index f68bd49..35cf4a1 100644
--- a/packages/SystemUI/src/com/android/systemui/dagger/ReferenceSystemUIModule.java
+++ b/packages/SystemUI/src/com/android/systemui/dagger/ReferenceSystemUIModule.java
@@ -71,6 +71,7 @@
 import com.android.systemui.statusbar.policy.SensorPrivacyController;
 import com.android.systemui.statusbar.policy.SensorPrivacyControllerImpl;
 import com.android.systemui.volume.dagger.VolumeModule;
+import com.android.systemui.wallpapers.dagger.WallpaperModule;
 
 import dagger.Binds;
 import dagger.Module;
@@ -106,6 +107,7 @@
         StatusBarEventsModule.class,
         StartCentralSurfacesModule.class,
         VolumeModule.class,
+        WallpaperModule.class,
         KeyboardShortcutsModule.class
 })
 public abstract class ReferenceSystemUIModule {
diff --git a/packages/SystemUI/src/com/android/systemui/dagger/SystemUICoreStartableModule.kt b/packages/SystemUI/src/com/android/systemui/dagger/SystemUICoreStartableModule.kt
index b1f513d..a560acc 100644
--- a/packages/SystemUI/src/com/android/systemui/dagger/SystemUICoreStartableModule.kt
+++ b/packages/SystemUI/src/com/android/systemui/dagger/SystemUICoreStartableModule.kt
@@ -51,6 +51,7 @@
 import com.android.systemui.statusbar.notification.InstantAppNotifier
 import com.android.systemui.statusbar.phone.KeyguardLiftController
 import com.android.systemui.statusbar.phone.LockscreenWallpaper
+import com.android.systemui.statusbar.phone.ScrimController
 import com.android.systemui.stylus.StylusUsiPowerStartable
 import com.android.systemui.temporarydisplay.chipbar.ChipbarCoordinator
 import com.android.systemui.theme.ThemeOverlayController
@@ -59,6 +60,7 @@
 import com.android.systemui.util.NotificationChannels
 import com.android.systemui.util.StartBinderLoggerModule
 import com.android.systemui.volume.VolumeUI
+import com.android.systemui.wallpapers.dagger.WallpaperModule
 import com.android.systemui.wmshell.WMShell
 import dagger.Binds
 import dagger.Module
@@ -72,6 +74,7 @@
     MultiUserUtilsModule::class,
     StartControlsStartableModule::class,
     StartBinderLoggerModule::class,
+    WallpaperModule::class,
 ])
 abstract class SystemUICoreStartableModule {
     /** Inject into AuthController.  */
@@ -316,4 +319,9 @@
     @IntoMap
     @ClassKey(LockscreenWallpaper::class)
     abstract fun bindLockscreenWallpaper(impl: LockscreenWallpaper): CoreStartable
+
+    @Binds
+    @IntoMap
+    @ClassKey(ScrimController::class)
+    abstract fun bindScrimController(impl: ScrimController): CoreStartable
 }
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/CentralSurfacesImpl.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/CentralSurfacesImpl.java
index 62e98f9..0a7ee52 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/CentralSurfacesImpl.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/CentralSurfacesImpl.java
@@ -3550,6 +3550,10 @@
         }
     };
 
+    /**
+     * @deprecated See {@link com.android.systemui.wallpapers.data.repository.WallpaperRepository}
+     * instead.
+     */
     private final BroadcastReceiver mWallpaperChangedReceiver = new BroadcastReceiver() {
         @Override
         public void onReceive(Context context, Intent intent) {
@@ -3569,7 +3573,6 @@
                     && (info != null && info.supportsAmbientMode());
 
             mNotificationShadeWindowController.setWallpaperSupportsAmbientMode(supportsAmbientMode);
-            mScrimController.setWallpaperSupportsAmbientMode(supportsAmbientMode);
             mKeyguardViewMediator.setWallpaperSupportsAmbientMode(supportsAmbientMode);
         }
     };
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/ScrimController.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/ScrimController.java
index 3cd09a6..e82ac59 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/ScrimController.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/ScrimController.java
@@ -48,6 +48,7 @@
 import com.android.keyguard.KeyguardUpdateMonitor;
 import com.android.keyguard.KeyguardUpdateMonitorCallback;
 import com.android.settingslib.Utils;
+import com.android.systemui.CoreStartable;
 import com.android.systemui.DejankUtils;
 import com.android.systemui.Dumpable;
 import com.android.systemui.R;
@@ -69,8 +70,10 @@
 import com.android.systemui.statusbar.policy.ConfigurationController;
 import com.android.systemui.statusbar.policy.KeyguardStateController;
 import com.android.systemui.util.AlarmTimeout;
+import com.android.systemui.util.kotlin.JavaAdapter;
 import com.android.systemui.util.wakelock.DelayedWakeLock;
 import com.android.systemui.util.wakelock.WakeLock;
+import com.android.systemui.wallpapers.data.repository.WallpaperRepository;
 
 import java.io.PrintWriter;
 import java.lang.annotation.Retention;
@@ -87,7 +90,8 @@
  * security method gets shown).
  */
 @SysUISingleton
-public class ScrimController implements ViewTreeObserver.OnPreDrawListener, Dumpable {
+public class ScrimController implements ViewTreeObserver.OnPreDrawListener, Dumpable,
+        CoreStartable {
 
     static final String TAG = "ScrimController";
     private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG);
@@ -205,6 +209,7 @@
     private final KeyguardVisibilityCallback mKeyguardVisibilityCallback;
     private final Handler mHandler;
     private final Executor mMainExecutor;
+    private final JavaAdapter mJavaAdapter;
     private final ScreenOffAnimationController mScreenOffAnimationController;
     private final KeyguardUnlockAnimationController mKeyguardUnlockAnimationController;
     private final StatusBarKeyguardViewManager mStatusBarKeyguardViewManager;
@@ -264,6 +269,7 @@
     private boolean mKeyguardOccluded;
 
     private KeyguardTransitionInteractor mKeyguardTransitionInteractor;
+    private final WallpaperRepository mWallpaperRepository;
     private CoroutineDispatcher mMainDispatcher;
     private boolean mIsBouncerToGoneTransitionRunning = false;
     private PrimaryBouncerToGoneTransitionViewModel mPrimaryBouncerToGoneTransitionViewModel;
@@ -293,11 +299,13 @@
             DockManager dockManager,
             ConfigurationController configurationController,
             @Main Executor mainExecutor,
+            JavaAdapter javaAdapter,
             ScreenOffAnimationController screenOffAnimationController,
             KeyguardUnlockAnimationController keyguardUnlockAnimationController,
             StatusBarKeyguardViewManager statusBarKeyguardViewManager,
             PrimaryBouncerToGoneTransitionViewModel primaryBouncerToGoneTransitionViewModel,
             KeyguardTransitionInteractor keyguardTransitionInteractor,
+            WallpaperRepository wallpaperRepository,
             @Main CoroutineDispatcher mainDispatcher,
             LargeScreenShadeInterpolator largeScreenShadeInterpolator) {
         mScrimStateListener = lightBarController::setScrimState;
@@ -310,6 +318,7 @@
         mKeyguardVisibilityCallback = new KeyguardVisibilityCallback();
         mHandler = handler;
         mMainExecutor = mainExecutor;
+        mJavaAdapter = javaAdapter;
         mScreenOffAnimationController = screenOffAnimationController;
         mTimeTicker = new AlarmTimeout(alarmManager, this::onHideWallpaperTimeout,
                 "hide_aod_wallpaper", mHandler);
@@ -341,9 +350,17 @@
         mColors = new GradientColors();
         mPrimaryBouncerToGoneTransitionViewModel = primaryBouncerToGoneTransitionViewModel;
         mKeyguardTransitionInteractor = keyguardTransitionInteractor;
+        mWallpaperRepository = wallpaperRepository;
         mMainDispatcher = mainDispatcher;
     }
 
+    @Override
+    public void start() {
+        mJavaAdapter.alwaysCollectFlow(
+                mWallpaperRepository.getWallpaperSupportsAmbientMode(),
+                this::setWallpaperSupportsAmbientMode);
+    }
+
     /**
      * Attach the controller to the supplied views.
      */
@@ -1531,7 +1548,7 @@
         pw.println(mState.getMaxLightRevealScrimAlpha());
     }
 
-    public void setWallpaperSupportsAmbientMode(boolean wallpaperSupportsAmbientMode) {
+    private void setWallpaperSupportsAmbientMode(boolean wallpaperSupportsAmbientMode) {
         mWallpaperSupportsAmbientMode = wallpaperSupportsAmbientMode;
         ScrimState[] states = ScrimState.values();
         for (int i = 0; i < states.length; i++) {
diff --git a/packages/SystemUI/src/com/android/systemui/tv/TvSysUIComponent.java b/packages/SystemUI/src/com/android/systemui/tv/TvSysUIComponent.java
index 5e489b0..82589d3 100644
--- a/packages/SystemUI/src/com/android/systemui/tv/TvSysUIComponent.java
+++ b/packages/SystemUI/src/com/android/systemui/tv/TvSysUIComponent.java
@@ -27,6 +27,7 @@
 import com.android.systemui.statusbar.dagger.CentralSurfacesDependenciesModule;
 import com.android.systemui.statusbar.notification.dagger.NotificationsModule;
 import com.android.systemui.statusbar.notification.row.NotificationRowModule;
+import com.android.systemui.wallpapers.dagger.NoopWallpaperModule;
 
 import dagger.Subcomponent;
 
@@ -39,6 +40,7 @@
         DefaultComponentBinder.class,
         DependencyProvider.class,
         KeyguardModule.class,
+        NoopWallpaperModule.class,
         NotificationRowModule.class,
         NotificationsModule.class,
         RecentsModule.class,
diff --git a/packages/SystemUI/src/com/android/systemui/wallpapers/dagger/NoopWallpaperModule.kt b/packages/SystemUI/src/com/android/systemui/wallpapers/dagger/NoopWallpaperModule.kt
new file mode 100644
index 0000000..baf88b0
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/wallpapers/dagger/NoopWallpaperModule.kt
@@ -0,0 +1,30 @@
+/*
+ * 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.
+ */
+
+package com.android.systemui.wallpapers.dagger
+
+import com.android.systemui.dagger.SysUISingleton
+import com.android.systemui.wallpapers.data.repository.NoopWallpaperRepository
+import com.android.systemui.wallpapers.data.repository.WallpaperRepository
+import dagger.Binds
+import dagger.Module
+
+@Module
+interface NoopWallpaperModule {
+    @Binds
+    @SysUISingleton
+    fun bindWallpaperRepository(impl: NoopWallpaperRepository): WallpaperRepository
+}
diff --git a/packages/SystemUI/src/com/android/systemui/wallpapers/dagger/WallpaperModule.kt b/packages/SystemUI/src/com/android/systemui/wallpapers/dagger/WallpaperModule.kt
new file mode 100644
index 0000000..1b89978
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/wallpapers/dagger/WallpaperModule.kt
@@ -0,0 +1,30 @@
+/*
+ * 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.
+ */
+
+package com.android.systemui.wallpapers.dagger
+
+import com.android.systemui.dagger.SysUISingleton
+import com.android.systemui.wallpapers.data.repository.WallpaperRepository
+import com.android.systemui.wallpapers.data.repository.WallpaperRepositoryImpl
+import dagger.Binds
+import dagger.Module
+
+@Module
+interface WallpaperModule {
+    @Binds
+    @SysUISingleton
+    fun bindWallpaperRepository(impl: WallpaperRepositoryImpl): WallpaperRepository
+}
diff --git a/packages/SystemUI/src/com/android/systemui/wallpapers/data/repository/NoopWallpaperRepository.kt b/packages/SystemUI/src/com/android/systemui/wallpapers/data/repository/NoopWallpaperRepository.kt
new file mode 100644
index 0000000..a640589
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/wallpapers/data/repository/NoopWallpaperRepository.kt
@@ -0,0 +1,33 @@
+/*
+ * 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.
+ */
+
+package com.android.systemui.wallpapers.data.repository
+
+import com.android.systemui.dagger.SysUISingleton
+import javax.inject.Inject
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.asStateFlow
+
+/**
+ * A no-op implementation of [WallpaperRepository].
+ *
+ * Used for variants of SysUI that do not support wallpaper but require other SysUI classes that
+ * have a wallpaper dependency.
+ */
+@SysUISingleton
+class NoopWallpaperRepository @Inject constructor() : WallpaperRepository {
+    override val wallpaperSupportsAmbientMode = MutableStateFlow(false).asStateFlow()
+}
diff --git a/packages/SystemUI/src/com/android/systemui/wallpapers/data/repository/WallpaperRepository.kt b/packages/SystemUI/src/com/android/systemui/wallpapers/data/repository/WallpaperRepository.kt
new file mode 100644
index 0000000..48895ff
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/wallpapers/data/repository/WallpaperRepository.kt
@@ -0,0 +1,105 @@
+/*
+ * 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.
+ */
+
+package com.android.systemui.wallpapers.data.repository
+
+import android.app.WallpaperManager
+import android.content.Context
+import android.content.Intent
+import android.content.IntentFilter
+import android.os.UserHandle
+import com.android.systemui.broadcast.BroadcastDispatcher
+import com.android.systemui.dagger.SysUISingleton
+import com.android.systemui.dagger.qualifiers.Application
+import com.android.systemui.user.data.model.SelectedUserModel
+import com.android.systemui.user.data.model.SelectionStatus
+import com.android.systemui.user.data.repository.UserRepository
+import javax.inject.Inject
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.filter
+import kotlinx.coroutines.flow.onStart
+import kotlinx.coroutines.flow.stateIn
+
+/** A repository storing information about the current wallpaper. */
+interface WallpaperRepository {
+    /** Emits true if the current user's current wallpaper supports ambient mode. */
+    val wallpaperSupportsAmbientMode: StateFlow<Boolean>
+}
+
+@SysUISingleton
+class WallpaperRepositoryImpl
+@Inject
+constructor(
+    @Application scope: CoroutineScope,
+    broadcastDispatcher: BroadcastDispatcher,
+    userRepository: UserRepository,
+    private val wallpaperManager: WallpaperManager,
+    context: Context,
+) : WallpaperRepository {
+    private val deviceSupportsAodWallpaper =
+        context.resources.getBoolean(com.android.internal.R.bool.config_dozeSupportsAodWallpaper)
+
+    private val wallpaperChanged: Flow<Unit> =
+        broadcastDispatcher
+            .broadcastFlow(
+                IntentFilter(Intent.ACTION_WALLPAPER_CHANGED),
+                user = UserHandle.ALL,
+            )
+            // The `combine` defining `wallpaperSupportsAmbientMode` will not run until both of the
+            // input flows emit at least once. Since this flow is an input flow, it needs to emit
+            // when it starts up to ensure that the `combine` will run if the user changes before we
+            // receive a ACTION_WALLPAPER_CHANGED intent.
+            // Note that the `selectedUser` flow does *not* need to emit on start because
+            // [UserRepository.selectedUser] is a state flow which will automatically emit a value
+            // on start.
+            .onStart { emit(Unit) }
+
+    private val selectedUser: Flow<SelectedUserModel> =
+        userRepository.selectedUser
+            // Only update the wallpaper status once the user selection has finished.
+            .filter { it.selectionStatus == SelectionStatus.SELECTION_COMPLETE }
+
+    override val wallpaperSupportsAmbientMode: StateFlow<Boolean> =
+        if (!wallpaperManager.isWallpaperSupported || !deviceSupportsAodWallpaper) {
+            MutableStateFlow(false).asStateFlow()
+        } else {
+            combine(wallpaperChanged, selectedUser) { _, selectedUser ->
+                    doesWallpaperSupportAmbientMode(selectedUser)
+                }
+                .stateIn(
+                    scope,
+                    // Always be listening for wallpaper changes.
+                    SharingStarted.Eagerly,
+                    initialValue =
+                        doesWallpaperSupportAmbientMode(userRepository.selectedUser.value),
+                )
+        }
+
+    private fun doesWallpaperSupportAmbientMode(selectedUser: SelectedUserModel): Boolean {
+        return wallpaperManager
+            .getWallpaperInfoForUser(
+                selectedUser.userInfo.id,
+            )
+            // If WallpaperInfo is null, it's ImageWallpaper which never supports ambient mode.
+            ?.supportsAmbientMode() == true
+    }
+}
diff --git a/packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/ScrimControllerTest.java b/packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/ScrimControllerTest.java
index 33c77cc..0dc1d9a 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/ScrimControllerTest.java
+++ b/packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/ScrimControllerTest.java
@@ -59,6 +59,7 @@
 import com.android.internal.colorextraction.ColorExtractor.GradientColors;
 import com.android.keyguard.BouncerPanelExpansionCalculator;
 import com.android.keyguard.KeyguardUpdateMonitor;
+import com.android.keyguard.TestScopeProvider;
 import com.android.systemui.DejankUtils;
 import com.android.systemui.SysuiTestCase;
 import com.android.systemui.animation.ShadeInterpolation;
@@ -76,9 +77,11 @@
 import com.android.systemui.statusbar.policy.FakeConfigurationController;
 import com.android.systemui.statusbar.policy.KeyguardStateController;
 import com.android.systemui.util.concurrency.FakeExecutor;
+import com.android.systemui.util.kotlin.JavaAdapter;
 import com.android.systemui.util.time.FakeSystemClock;
 import com.android.systemui.util.wakelock.DelayedWakeLock;
 import com.android.systemui.utils.os.FakeHandler;
+import com.android.systemui.wallpapers.data.repository.FakeWallpaperRepository;
 
 import com.google.common.truth.Expect;
 
@@ -99,6 +102,7 @@
 import java.util.Map;
 
 import kotlinx.coroutines.CoroutineDispatcher;
+import kotlinx.coroutines.test.TestScope;
 
 @RunWith(AndroidTestingRunner.class)
 @TestableLooper.RunWithLooper(setAsMainLooper = true)
@@ -112,6 +116,9 @@
     private final LargeScreenShadeInterpolator
             mLinearLargeScreenShadeInterpolator = new LinearLargeScreenShadeInterpolator();
 
+    private final TestScope mTestScope = TestScopeProvider.getTestScope();
+    private final JavaAdapter mJavaAdapter = new JavaAdapter(mTestScope.getBackgroundScope());
+
     private ScrimController mScrimController;
     private ScrimView mScrimBehind;
     private ScrimView mNotificationsScrim;
@@ -135,6 +142,7 @@
     @Mock private KeyguardUnlockAnimationController mKeyguardUnlockAnimationController;
     @Mock private PrimaryBouncerToGoneTransitionViewModel mPrimaryBouncerToGoneTransitionViewModel;
     @Mock private KeyguardTransitionInteractor mKeyguardTransitionInteractor;
+    private final FakeWallpaperRepository mWallpaperRepository = new FakeWallpaperRepository();
     @Mock private CoroutineDispatcher mMainDispatcher;
     @Mock private TypedArray mMockTypedArray;
 
@@ -272,19 +280,25 @@
                 mDockManager,
                 mConfigurationController,
                 new FakeExecutor(new FakeSystemClock()),
+                mJavaAdapter,
                 mScreenOffAnimationController,
                 mKeyguardUnlockAnimationController,
                 mStatusBarKeyguardViewManager,
                 mPrimaryBouncerToGoneTransitionViewModel,
                 mKeyguardTransitionInteractor,
+                mWallpaperRepository,
                 mMainDispatcher,
                 mLinearLargeScreenShadeInterpolator);
+        mScrimController.start();
         mScrimController.setScrimVisibleListener(visible -> mScrimVisibility = visible);
         mScrimController.attachViews(mScrimBehind, mNotificationsScrim, mScrimInFront);
         mScrimController.setAnimatorListener(mAnimatorListener);
 
         mScrimController.setHasBackdrop(false);
-        mScrimController.setWallpaperSupportsAmbientMode(false);
+
+        mWallpaperRepository.getWallpaperSupportsAmbientMode().setValue(false);
+        mTestScope.getTestScheduler().runCurrent();
+
         mScrimController.transitionTo(ScrimState.KEYGUARD);
         finishAnimationsImmediately();
     }
@@ -385,7 +399,9 @@
 
     @Test
     public void transitionToAod_withAodWallpaper() {
-        mScrimController.setWallpaperSupportsAmbientMode(true);
+        mWallpaperRepository.getWallpaperSupportsAmbientMode().setValue(true);
+        mTestScope.getTestScheduler().runCurrent();
+
         mScrimController.transitionTo(ScrimState.AOD);
         finishAnimationsImmediately();
 
@@ -407,7 +423,9 @@
     @Test
     public void transitionToAod_withAodWallpaperAndLockScreenWallpaper() {
         mScrimController.setHasBackdrop(true);
-        mScrimController.setWallpaperSupportsAmbientMode(true);
+        mWallpaperRepository.getWallpaperSupportsAmbientMode().setValue(true);
+        mTestScope.getTestScheduler().runCurrent();
+
         mScrimController.transitionTo(ScrimState.AOD);
         finishAnimationsImmediately();
 
@@ -424,7 +442,9 @@
 
     @Test
     public void setHasBackdrop_withAodWallpaperAndAlbumArt() {
-        mScrimController.setWallpaperSupportsAmbientMode(true);
+        mWallpaperRepository.getWallpaperSupportsAmbientMode().setValue(true);
+        mTestScope.getTestScheduler().runCurrent();
+
         mScrimController.transitionTo(ScrimState.AOD);
         finishAnimationsImmediately();
         mScrimController.setHasBackdrop(true);
@@ -537,7 +557,9 @@
         // Pre-condition
         // Need to go to AoD first because PULSING doesn't change
         // the back scrim opacity - otherwise it would hide AoD wallpapers.
-        mScrimController.setWallpaperSupportsAmbientMode(false);
+        mWallpaperRepository.getWallpaperSupportsAmbientMode().setValue(false);
+        mTestScope.getTestScheduler().runCurrent();
+
         mScrimController.transitionTo(ScrimState.AOD);
         finishAnimationsImmediately();
         assertScrimAlpha(Map.of(
@@ -965,18 +987,22 @@
                 mDockManager,
                 mConfigurationController,
                 new FakeExecutor(new FakeSystemClock()),
+                mJavaAdapter,
                 mScreenOffAnimationController,
                 mKeyguardUnlockAnimationController,
                 mStatusBarKeyguardViewManager,
                 mPrimaryBouncerToGoneTransitionViewModel,
                 mKeyguardTransitionInteractor,
+                mWallpaperRepository,
                 mMainDispatcher,
                 mLinearLargeScreenShadeInterpolator);
+        mScrimController.start();
         mScrimController.setScrimVisibleListener(visible -> mScrimVisibility = visible);
         mScrimController.attachViews(mScrimBehind, mNotificationsScrim, mScrimInFront);
         mScrimController.setAnimatorListener(mAnimatorListener);
         mScrimController.setHasBackdrop(false);
-        mScrimController.setWallpaperSupportsAmbientMode(false);
+        mWallpaperRepository.getWallpaperSupportsAmbientMode().setValue(false);
+        mTestScope.getTestScheduler().runCurrent();
         mScrimController.transitionTo(ScrimState.KEYGUARD);
         finishAnimationsImmediately();
 
@@ -1101,7 +1127,9 @@
 
     @Test
     public void testWillHideAodWallpaper() {
-        mScrimController.setWallpaperSupportsAmbientMode(true);
+        mWallpaperRepository.getWallpaperSupportsAmbientMode().setValue(true);
+        mTestScope.getTestScheduler().runCurrent();
+
         mScrimController.transitionTo(ScrimState.AOD);
         verify(mAlarmManager).setExact(anyInt(), anyLong(), any(), any(), any());
         mScrimController.transitionTo(ScrimState.KEYGUARD);
@@ -1112,7 +1140,8 @@
     public void testWillHideDockedWallpaper() {
         mAlwaysOnEnabled = false;
         when(mDockManager.isDocked()).thenReturn(true);
-        mScrimController.setWallpaperSupportsAmbientMode(true);
+        mWallpaperRepository.getWallpaperSupportsAmbientMode().setValue(true);
+        mTestScope.getTestScheduler().runCurrent();
 
         mScrimController.transitionTo(ScrimState.AOD);
 
@@ -1161,7 +1190,9 @@
 
     @Test
     public void testHidesShowWhenLockedActivity() {
-        mScrimController.setWallpaperSupportsAmbientMode(true);
+        mWallpaperRepository.getWallpaperSupportsAmbientMode().setValue(true);
+        mTestScope.getTestScheduler().runCurrent();
+
         mScrimController.setKeyguardOccluded(true);
         mScrimController.transitionTo(ScrimState.AOD);
         finishAnimationsImmediately();
@@ -1178,7 +1209,9 @@
 
     @Test
     public void testHidesShowWhenLockedActivity_whenAlreadyInAod() {
-        mScrimController.setWallpaperSupportsAmbientMode(true);
+        mWallpaperRepository.getWallpaperSupportsAmbientMode().setValue(true);
+        mTestScope.getTestScheduler().runCurrent();
+
         mScrimController.transitionTo(ScrimState.AOD);
         finishAnimationsImmediately();
         assertScrimAlpha(Map.of(
diff --git a/packages/SystemUI/tests/src/com/android/systemui/wallpapers/data/repository/FakeWallpaperRepository.kt b/packages/SystemUI/tests/src/com/android/systemui/wallpapers/data/repository/FakeWallpaperRepository.kt
new file mode 100644
index 0000000..6fc36b0
--- /dev/null
+++ b/packages/SystemUI/tests/src/com/android/systemui/wallpapers/data/repository/FakeWallpaperRepository.kt
@@ -0,0 +1,24 @@
+/*
+ * 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.
+ */
+
+package com.android.systemui.wallpapers.data.repository
+
+import kotlinx.coroutines.flow.MutableStateFlow
+
+/** Fake implementation of the wallpaper repository. */
+class FakeWallpaperRepository : WallpaperRepository {
+    override val wallpaperSupportsAmbientMode = MutableStateFlow(false)
+}
diff --git a/packages/SystemUI/tests/src/com/android/systemui/wallpapers/data/repository/WallpaperRepositoryImplTest.kt b/packages/SystemUI/tests/src/com/android/systemui/wallpapers/data/repository/WallpaperRepositoryImplTest.kt
new file mode 100644
index 0000000..132b9b4
--- /dev/null
+++ b/packages/SystemUI/tests/src/com/android/systemui/wallpapers/data/repository/WallpaperRepositoryImplTest.kt
@@ -0,0 +1,262 @@
+/*
+ * 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.
+ */
+
+package com.android.systemui.wallpapers.data.repository
+
+import android.app.WallpaperInfo
+import android.app.WallpaperManager
+import android.content.Intent
+import android.content.pm.UserInfo
+import androidx.test.filters.SmallTest
+import com.android.systemui.SysuiTestCase
+import com.android.systemui.coroutines.collectLastValue
+import com.android.systemui.user.data.model.SelectedUserModel
+import com.android.systemui.user.data.model.SelectionStatus
+import com.android.systemui.user.data.repository.FakeUserRepository
+import com.android.systemui.util.mockito.any
+import com.android.systemui.util.mockito.mock
+import com.android.systemui.util.mockito.whenever
+import com.google.common.truth.Truth.assertThat
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.test.StandardTestDispatcher
+import kotlinx.coroutines.test.TestScope
+import kotlinx.coroutines.test.runTest
+import org.junit.Before
+import org.junit.Test
+
+@SmallTest
+@OptIn(ExperimentalCoroutinesApi::class)
+class WallpaperRepositoryImplTest : SysuiTestCase() {
+
+    private val testScope = TestScope(StandardTestDispatcher())
+    private val userRepository = FakeUserRepository()
+    private val wallpaperManager: WallpaperManager = mock()
+
+    private val underTest: WallpaperRepositoryImpl by lazy {
+        WallpaperRepositoryImpl(
+            testScope.backgroundScope,
+            fakeBroadcastDispatcher,
+            userRepository,
+            wallpaperManager,
+            context,
+        )
+    }
+
+    @Before
+    fun setUp() {
+        whenever(wallpaperManager.isWallpaperSupported).thenReturn(true)
+        context.orCreateTestableResources.addOverride(
+            com.android.internal.R.bool.config_dozeSupportsAodWallpaper,
+            true,
+        )
+    }
+
+    @Test
+    fun wallpaperSupportsAmbientMode_nullInfo_false() =
+        testScope.runTest {
+            val latest by collectLastValue(underTest.wallpaperSupportsAmbientMode)
+
+            whenever(wallpaperManager.getWallpaperInfoForUser(any())).thenReturn(null)
+
+            fakeBroadcastDispatcher.sendIntentToMatchingReceiversOnly(
+                context,
+                Intent(Intent.ACTION_WALLPAPER_CHANGED),
+            )
+
+            assertThat(latest).isFalse()
+        }
+
+    @Test
+    fun wallpaperSupportsAmbientMode_infoDoesNotSupport_false() =
+        testScope.runTest {
+            val latest by collectLastValue(underTest.wallpaperSupportsAmbientMode)
+
+            whenever(wallpaperManager.getWallpaperInfoForUser(any())).thenReturn(UNSUPPORTED_WP)
+
+            fakeBroadcastDispatcher.sendIntentToMatchingReceiversOnly(
+                context,
+                Intent(Intent.ACTION_WALLPAPER_CHANGED),
+            )
+
+            assertThat(latest).isFalse()
+        }
+
+    @Test
+    fun wallpaperSupportsAmbientMode_infoSupports_true() =
+        testScope.runTest {
+            val latest by collectLastValue(underTest.wallpaperSupportsAmbientMode)
+
+            whenever(wallpaperManager.getWallpaperInfoForUser(any())).thenReturn(SUPPORTED_WP)
+
+            fakeBroadcastDispatcher.sendIntentToMatchingReceiversOnly(
+                context,
+                Intent(Intent.ACTION_WALLPAPER_CHANGED),
+            )
+
+            assertThat(latest).isTrue()
+        }
+
+    @Test
+    fun wallpaperSupportsAmbientMode_initialValueIsFetched_true() =
+        testScope.runTest {
+            whenever(wallpaperManager.getWallpaperInfoForUser(USER_WITH_SUPPORTED_WP.id))
+                .thenReturn(SUPPORTED_WP)
+            userRepository.setUserInfos(listOf(USER_WITH_SUPPORTED_WP))
+            userRepository.setSelectedUserInfo(USER_WITH_SUPPORTED_WP)
+
+            // WHEN the repo initially starts up (underTest is lazy), then it fetches the current
+            // value for the wallpaper
+            assertThat(underTest.wallpaperSupportsAmbientMode.value).isTrue()
+        }
+
+    @Test
+    fun wallpaperSupportsAmbientMode_initialValueIsFetched_false() =
+        testScope.runTest {
+            whenever(wallpaperManager.getWallpaperInfoForUser(USER_WITH_UNSUPPORTED_WP.id))
+                .thenReturn(UNSUPPORTED_WP)
+            userRepository.setUserInfos(listOf(USER_WITH_UNSUPPORTED_WP))
+            userRepository.setSelectedUserInfo(USER_WITH_UNSUPPORTED_WP)
+
+            // WHEN the repo initially starts up (underTest is lazy), then it fetches the current
+            // value for the wallpaper
+            assertThat(underTest.wallpaperSupportsAmbientMode.value).isFalse()
+        }
+
+    @Test
+    fun wallpaperSupportsAmbientMode_updatesOnUserChanged() =
+        testScope.runTest {
+            val latest by collectLastValue(underTest.wallpaperSupportsAmbientMode)
+
+            whenever(wallpaperManager.getWallpaperInfoForUser(USER_WITH_SUPPORTED_WP.id))
+                .thenReturn(SUPPORTED_WP)
+            whenever(wallpaperManager.getWallpaperInfoForUser(USER_WITH_UNSUPPORTED_WP.id))
+                .thenReturn(UNSUPPORTED_WP)
+            userRepository.setUserInfos(listOf(USER_WITH_SUPPORTED_WP, USER_WITH_UNSUPPORTED_WP))
+
+            // WHEN a user with supported wallpaper is selected
+            userRepository.setSelectedUserInfo(USER_WITH_SUPPORTED_WP)
+
+            // THEN it's true
+            assertThat(latest).isTrue()
+
+            // WHEN the user is switched to a user with unsupported wallpaper
+            userRepository.setSelectedUserInfo(USER_WITH_UNSUPPORTED_WP)
+
+            // THEN it's false
+            assertThat(latest).isFalse()
+        }
+
+    @Test
+    fun wallpaperSupportsAmbientMode_doesNotUpdateOnUserChanging() =
+        testScope.runTest {
+            val latest by collectLastValue(underTest.wallpaperSupportsAmbientMode)
+
+            whenever(wallpaperManager.getWallpaperInfoForUser(USER_WITH_SUPPORTED_WP.id))
+                .thenReturn(SUPPORTED_WP)
+            whenever(wallpaperManager.getWallpaperInfoForUser(USER_WITH_UNSUPPORTED_WP.id))
+                .thenReturn(UNSUPPORTED_WP)
+            userRepository.setUserInfos(listOf(USER_WITH_SUPPORTED_WP, USER_WITH_UNSUPPORTED_WP))
+
+            // WHEN a user with supported wallpaper is selected
+            userRepository.setSelectedUserInfo(USER_WITH_SUPPORTED_WP)
+
+            // THEN it's true
+            assertThat(latest).isTrue()
+
+            // WHEN the user has started switching to a user with unsupported wallpaper but hasn't
+            // finished yet
+            userRepository.selectedUser.value =
+                SelectedUserModel(USER_WITH_UNSUPPORTED_WP, SelectionStatus.SELECTION_IN_PROGRESS)
+
+            // THEN it still matches the old user
+            assertThat(latest).isTrue()
+        }
+
+    @Test
+    fun wallpaperSupportsAmbientMode_updatesOnIntent() =
+        testScope.runTest {
+            val latest by collectLastValue(underTest.wallpaperSupportsAmbientMode)
+
+            val info: WallpaperInfo = mock()
+            whenever(info.supportsAmbientMode()).thenReturn(false)
+            whenever(wallpaperManager.getWallpaperInfoForUser(any())).thenReturn(info)
+
+            assertThat(latest).isFalse()
+
+            // WHEN the info now supports ambient mode and a broadcast is sent
+            whenever(info.supportsAmbientMode()).thenReturn(true)
+            fakeBroadcastDispatcher.sendIntentToMatchingReceiversOnly(
+                context,
+                Intent(Intent.ACTION_WALLPAPER_CHANGED),
+            )
+
+            // THEN the flow updates
+            assertThat(latest).isTrue()
+        }
+
+    @Test
+    fun wallpaperSupportsAmbientMode_wallpaperNotSupported_alwaysFalse() =
+        testScope.runTest {
+            whenever(wallpaperManager.isWallpaperSupported).thenReturn(false)
+
+            val latest by collectLastValue(underTest.wallpaperSupportsAmbientMode)
+            assertThat(latest).isFalse()
+
+            // Even WHEN the current wallpaper *does* support ambient mode
+            whenever(wallpaperManager.getWallpaperInfoForUser(any())).thenReturn(SUPPORTED_WP)
+
+            fakeBroadcastDispatcher.sendIntentToMatchingReceiversOnly(
+                context,
+                Intent(Intent.ACTION_WALLPAPER_CHANGED),
+            )
+
+            // THEN the value is still false because wallpaper isn't supported
+            assertThat(latest).isFalse()
+        }
+
+    @Test
+    fun wallpaperSupportsAmbientMode_deviceDoesNotSupportAmbientWallpaper_alwaysFalse() =
+        testScope.runTest {
+            context.orCreateTestableResources.addOverride(
+                com.android.internal.R.bool.config_dozeSupportsAodWallpaper,
+                false
+            )
+
+            val latest by collectLastValue(underTest.wallpaperSupportsAmbientMode)
+            assertThat(latest).isFalse()
+
+            // Even WHEN the current wallpaper *does* support ambient mode
+            whenever(wallpaperManager.getWallpaperInfoForUser(any())).thenReturn(SUPPORTED_WP)
+
+            fakeBroadcastDispatcher.sendIntentToMatchingReceiversOnly(
+                context,
+                Intent(Intent.ACTION_WALLPAPER_CHANGED),
+            )
+
+            // THEN the value is still false because the device doesn't support it
+            assertThat(latest).isFalse()
+        }
+
+    private companion object {
+        val USER_WITH_UNSUPPORTED_WP = UserInfo(/* id= */ 3, /* name= */ "user3", /* flags= */ 0)
+        val UNSUPPORTED_WP =
+            mock<WallpaperInfo>().apply { whenever(this.supportsAmbientMode()).thenReturn(false) }
+
+        val USER_WITH_SUPPORTED_WP = UserInfo(/* id= */ 4, /* name= */ "user4", /* flags= */ 0)
+        val SUPPORTED_WP =
+            mock<WallpaperInfo>().apply { whenever(this.supportsAmbientMode()).thenReturn(true) }
+    }
+}