diff --git a/packages/SystemUI/multivalentTests/src/com/android/systemui/keyguard/data/repository/KeyguardRepositoryImplTest.kt b/packages/SystemUI/multivalentTests/src/com/android/systemui/keyguard/data/repository/KeyguardRepositoryImplTest.kt
index 5dac37a..48caf3e 100644
--- a/packages/SystemUI/multivalentTests/src/com/android/systemui/keyguard/data/repository/KeyguardRepositoryImplTest.kt
+++ b/packages/SystemUI/multivalentTests/src/com/android/systemui/keyguard/data/repository/KeyguardRepositoryImplTest.kt
@@ -140,6 +140,27 @@
         }
 
     @Test
+    fun panelAlpha() =
+        testScope.runTest {
+            assertThat(underTest.panelAlpha.value).isEqualTo(1f)
+
+            underTest.setPanelAlpha(0.1f)
+            assertThat(underTest.panelAlpha.value).isEqualTo(0.1f)
+
+            underTest.setPanelAlpha(0.2f)
+            assertThat(underTest.panelAlpha.value).isEqualTo(0.2f)
+
+            underTest.setPanelAlpha(0.3f)
+            assertThat(underTest.panelAlpha.value).isEqualTo(0.3f)
+
+            underTest.setPanelAlpha(0.5f)
+            assertThat(underTest.panelAlpha.value).isEqualTo(0.5f)
+
+            underTest.setPanelAlpha(1.0f)
+            assertThat(underTest.panelAlpha.value).isEqualTo(1f)
+        }
+
+    @Test
     fun topClippingBounds() =
         testScope.runTest {
             assertThat(underTest.topClippingBounds.value).isNull()
diff --git a/packages/SystemUI/src/com/android/systemui/keyguard/data/repository/KeyguardRepository.kt b/packages/SystemUI/src/com/android/systemui/keyguard/data/repository/KeyguardRepository.kt
index d508b2b..cdf3b06 100644
--- a/packages/SystemUI/src/com/android/systemui/keyguard/data/repository/KeyguardRepository.kt
+++ b/packages/SystemUI/src/com/android/systemui/keyguard/data/repository/KeyguardRepository.kt
@@ -78,6 +78,8 @@
 
     val keyguardAlpha: StateFlow<Float>
 
+    val panelAlpha: MutableStateFlow<Float>
+
     /**
      * Observable for whether the keyguard is showing.
      *
@@ -250,6 +252,9 @@
     /** Sets the current amount of alpha that should be used for rendering the keyguard. */
     fun setKeyguardAlpha(alpha: Float)
 
+    /** Temporary shim for fading out content when the brightness slider is used */
+    fun setPanelAlpha(alpha: Float)
+
     /** Whether the device is actively dreaming */
     fun setDreaming(isDreaming: Boolean)
 
@@ -338,6 +343,8 @@
     private val _keyguardAlpha = MutableStateFlow(1f)
     override val keyguardAlpha = _keyguardAlpha.asStateFlow()
 
+    override val panelAlpha: MutableStateFlow<Float> = MutableStateFlow(1f)
+
     private val _clockShouldBeCentered = MutableStateFlow(true)
     override val clockShouldBeCentered: Flow<Boolean> = _clockShouldBeCentered.asStateFlow()
 
@@ -659,6 +666,10 @@
         _keyguardAlpha.value = alpha
     }
 
+    override fun setPanelAlpha(alpha: Float) {
+        panelAlpha.value = alpha
+    }
+
     override fun setDreaming(isDreaming: Boolean) {
         this.isDreaming.value = isDreaming
     }
diff --git a/packages/SystemUI/src/com/android/systemui/keyguard/domain/interactor/KeyguardInteractor.kt b/packages/SystemUI/src/com/android/systemui/keyguard/domain/interactor/KeyguardInteractor.kt
index ef96be0..ab1194e 100644
--- a/packages/SystemUI/src/com/android/systemui/keyguard/domain/interactor/KeyguardInteractor.kt
+++ b/packages/SystemUI/src/com/android/systemui/keyguard/domain/interactor/KeyguardInteractor.kt
@@ -321,6 +321,10 @@
     @Deprecated("Use the relevant TransitionViewModel")
     val keyguardAlpha: Flow<Float> = repository.keyguardAlpha
 
+    /** Temporary shim for fading out content when the brightness slider is used */
+    @Deprecated("SceneContainer uses NotificationStackAppearanceInteractor")
+    val panelAlpha: StateFlow<Float> = repository.panelAlpha.asStateFlow()
+
     /**
      * When the lockscreen can be dismissed, emit an alpha value as the user swipes up. This is
      * useful just before the code commits to moving to GONE.
@@ -458,6 +462,10 @@
         repository.setKeyguardAlpha(alpha)
     }
 
+    fun setPanelAlpha(alpha: Float) {
+        repository.setPanelAlpha(alpha)
+    }
+
     fun setAnimateDozingTransitions(animate: Boolean) {
         repository.setAnimateDozingTransitions(animate)
     }
diff --git a/packages/SystemUI/src/com/android/systemui/shade/NotificationPanelViewController.java b/packages/SystemUI/src/com/android/systemui/shade/NotificationPanelViewController.java
index 8b78f54..9624e0f 100644
--- a/packages/SystemUI/src/com/android/systemui/shade/NotificationPanelViewController.java
+++ b/packages/SystemUI/src/com/android/systemui/shade/NotificationPanelViewController.java
@@ -483,7 +483,9 @@
     private float mBottomAreaShadeAlpha;
     final ValueAnimator mBottomAreaShadeAlphaAnimator;
     private final AnimatableProperty mPanelAlphaAnimator = AnimatableProperty.from("panelAlpha",
-            NotificationPanelView::setPanelAlphaInternal,
+            (view, alpha) -> {
+                setAlphaInternal(alpha);
+            },
             NotificationPanelView::getCurrentPanelAlpha,
             R.id.panel_alpha_animator_tag, R.id.panel_alpha_animator_start_tag,
             R.id.panel_alpha_animator_end_tag);
@@ -3074,6 +3076,11 @@
         }
     }
 
+    private void setAlphaInternal(float alpha) {
+        mKeyguardInteractor.setPanelAlpha(alpha / 255f);
+        mView.setPanelAlphaInternal(alpha);
+    }
+
     @Override
     public void setAlphaChangeAnimationEndAction(Runnable r) {
         mPanelAlphaEndAction = r;
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/NotificationStackScrollLayoutController.java b/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/NotificationStackScrollLayoutController.java
index 6a3055f..d984685 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/NotificationStackScrollLayoutController.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/NotificationStackScrollLayoutController.java
@@ -68,7 +68,6 @@
 import com.android.systemui.classifier.FalsingCollector;
 import com.android.systemui.dagger.SysUISingleton;
 import com.android.systemui.dump.DumpManager;
-import com.android.systemui.keyguard.MigrateClocksToBlueprint;
 import com.android.systemui.keyguard.data.repository.KeyguardTransitionRepository;
 import com.android.systemui.keyguard.shared.model.KeyguardState;
 import com.android.systemui.keyguard.shared.model.TransitionStep;
@@ -1320,7 +1319,10 @@
         updateAlpha();
     }
 
-    void setMaxAlphaFromView(float alpha) {
+    /**
+     * Max alpha from the containing view. Used by brightness slider as an example.
+     */
+    public void setMaxAlphaFromView(float alpha) {
         mMaxAlphaFromView = alpha;
         updateAlpha();
     }
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/ui/viewbinder/SharedNotificationContainerBinder.kt b/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/ui/viewbinder/SharedNotificationContainerBinder.kt
index cf5366b..497ffca 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/ui/viewbinder/SharedNotificationContainerBinder.kt
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/ui/viewbinder/SharedNotificationContainerBinder.kt
@@ -154,6 +154,14 @@
                         }
                     }
 
+                    if (!SceneContainerFlag.isEnabled) {
+                        launch {
+                            // For when the entire view should fade, such as with the brightness
+                            // slider
+                            viewModel.panelAlpha.collect { controller.setMaxAlphaFromView(it) }
+                        }
+                    }
+
                     if (communalHub()) {
                         launch {
                             viewModel.glanceableHubAlpha.collect {
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/ui/viewmodel/SharedNotificationContainerViewModel.kt b/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/ui/viewmodel/SharedNotificationContainerViewModel.kt
index 77d8f50..a35709d 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/ui/viewmodel/SharedNotificationContainerViewModel.kt
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/ui/viewmodel/SharedNotificationContainerViewModel.kt
@@ -470,6 +470,8 @@
             }
             .dumpWhileCollecting("isTransitioningToHiddenKeyguard")
 
+    val panelAlpha = keyguardInteractor.panelAlpha
+
     fun keyguardAlpha(viewState: ViewStateAccessor): Flow<Float> {
         // All transition view models are mututally exclusive, and safe to merge
         val alphaTransitions =
diff --git a/packages/SystemUI/tests/utils/src/com/android/systemui/keyguard/data/repository/FakeKeyguardRepository.kt b/packages/SystemUI/tests/utils/src/com/android/systemui/keyguard/data/repository/FakeKeyguardRepository.kt
index 2d100f0..dca531a 100644
--- a/packages/SystemUI/tests/utils/src/com/android/systemui/keyguard/data/repository/FakeKeyguardRepository.kt
+++ b/packages/SystemUI/tests/utils/src/com/android/systemui/keyguard/data/repository/FakeKeyguardRepository.kt
@@ -119,6 +119,8 @@
     private val _keyguardAlpha = MutableStateFlow(1f)
     override val keyguardAlpha: StateFlow<Float> = _keyguardAlpha
 
+    override val panelAlpha: MutableStateFlow<Float> = MutableStateFlow(1f)
+
     override val lastRootViewTapPosition: MutableStateFlow<Point?> = MutableStateFlow(null)
 
     override val ambientIndicationVisible: MutableStateFlow<Boolean> = MutableStateFlow(false)
@@ -259,6 +261,10 @@
         _keyguardAlpha.value = alpha
     }
 
+    override fun setPanelAlpha(alpha: Float) {
+        panelAlpha.value = alpha
+    }
+
     fun setIsEncryptedOrLockdown(value: Boolean) {
         _isEncryptedOrLockdown.value = value
     }