diff --git a/services/core/java/com/android/server/wm/Dimmer.java b/services/core/java/com/android/server/wm/Dimmer.java
index e7ab63eab2025..13a1cb6daf385 100644
--- a/services/core/java/com/android/server/wm/Dimmer.java
+++ b/services/core/java/com/android/server/wm/Dimmer.java
@@ -216,46 +216,16 @@ class Dimmer {
             return;
         }
 
-        if (container != null) {
-            // The dim method is called from WindowState.prepareSurfaces(), which is always called
-            // in the correct Z from lowest Z to highest. This ensures that the dim layer is always
-            // relative to the highest Z layer with a dim.
-            t.setRelativeLayer(d.mDimLayer, container.getSurfaceControl(), relativeLayer);
-        } else {
-            t.setLayer(d.mDimLayer, Integer.MAX_VALUE);
-        }
+        // The dim method is called from WindowState.prepareSurfaces(), which is always called
+        // in the correct Z from lowest Z to highest. This ensures that the dim layer is always
+        // relative to the highest Z layer with a dim.
+        t.setRelativeLayer(d.mDimLayer, container.getSurfaceControl(), relativeLayer);
         t.setAlpha(d.mDimLayer, alpha);
         t.setBackgroundBlurRadius(d.mDimLayer, blurRadius);
 
         d.mDimming = true;
     }
 
-    /**
-     * Finish a dim started by dimAbove in the case there was no call to dimAbove.
-     *
-     * @param t A Transaction in which to finish the dim.
-     */
-    void stopDim(SurfaceControl.Transaction t) {
-        if (mDimState != null) {
-            t.hide(mDimState.mDimLayer);
-            mDimState.isVisible = false;
-            mDimState.mDontReset = false;
-        }
-    }
-
-    /**
-     * Place a Dim above the entire host container. The caller is responsible for calling stopDim to
-     * remove this effect. If the Dim can be assosciated with a particular child of the host
-     * consider using the other variant of dimAbove which ties the Dim lifetime to the child
-     * lifetime more explicitly.
-     *
-     * @param t     A transaction in which to apply the Dim.
-     * @param alpha The alpha at which to Dim.
-     */
-    void dimAbove(SurfaceControl.Transaction t, float alpha) {
-        dim(t, null, 1, alpha, 0);
-    }
-
     /**
      * Place a dim above the given container, which should be a child of the host container.
      * for each call to {@link WindowContainer#prepareSurfaces} the Dim state will be reset
diff --git a/services/tests/wmtests/src/com/android/server/wm/DimmerTests.java b/services/tests/wmtests/src/com/android/server/wm/DimmerTests.java
index 55a7c1ba0bcab..befe4e85a7de8 100644
--- a/services/tests/wmtests/src/com/android/server/wm/DimmerTests.java
+++ b/services/tests/wmtests/src/com/android/server/wm/DimmerTests.java
@@ -24,7 +24,6 @@ import static com.android.dx.mockito.inline.extended.ExtendedMockito.times;
 import static com.android.dx.mockito.inline.extended.ExtendedMockito.verify;
 import static com.android.server.wm.SurfaceAnimator.ANIMATION_TYPE_DIMMER;
 
-import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.anyBoolean;
@@ -138,35 +137,13 @@ public class DimmerTests extends WindowTestsBase {
         mDimmer = new Dimmer(mHost, mSurfaceAnimatorStarter);
     }
 
-    @Test
-    public void testDimAboveNoChildCreatesSurface() {
-        final float alpha = 0.8f;
-        mDimmer.dimAbove(mTransaction, alpha);
-
-        SurfaceControl dimLayer = getDimLayer();
-
-        assertNotNull("Dimmer should have created a surface", dimLayer);
-
-        verify(mTransaction).setAlpha(dimLayer, alpha);
-        verify(mTransaction).setLayer(dimLayer, Integer.MAX_VALUE);
-    }
-
-    @Test
-    public void testDimAboveNoChildRedundantlyUpdatesAlphaOnExistingSurface() {
-        float alpha = 0.8f;
-        mDimmer.dimAbove(mTransaction, alpha);
-        final SurfaceControl firstSurface = getDimLayer();
-
-        alpha = 0.9f;
-        mDimmer.dimAbove(mTransaction, alpha);
-
-        assertEquals(firstSurface, getDimLayer());
-        verify(mTransaction).setAlpha(firstSurface, 0.9f);
-    }
-
     @Test
     public void testUpdateDimsAppliesCrop() {
-        mDimmer.dimAbove(mTransaction, 0.8f);
+        TestWindowContainer child = new TestWindowContainer(mWm);
+        mHost.addChild(child, 0);
+
+        final float alpha = 0.8f;
+        mDimmer.dimAbove(mTransaction, child, alpha);
 
         int width = 100;
         int height = 300;
@@ -177,17 +154,6 @@ public class DimmerTests extends WindowTestsBase {
         verify(mTransaction).show(getDimLayer());
     }
 
-    @Test
-    public void testDimAboveNoChildNotReset() {
-        mDimmer.dimAbove(mTransaction, 0.8f);
-        SurfaceControl dimLayer = getDimLayer();
-        mDimmer.resetDimStates();
-
-        mDimmer.updateDims(mTransaction, new Rect());
-        verify(mTransaction).show(getDimLayer());
-        verify(mTransaction, never()).remove(dimLayer);
-    }
-
     @Test
     public void testDimAboveWithChildCreatesSurfaceAboveChild() {
         TestWindowContainer child = new TestWindowContainer(mWm);