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 f784723860063..80093a3da3255 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/ScrimController.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/ScrimController.java
@@ -791,20 +791,28 @@ public class ScrimController implements ViewTreeObserver.OnPreDrawListener, Dump
             if (!mScreenOffAnimationController.shouldExpandNotifications()
                     && !mAnimatingPanelExpansionOnUnlock
                     && !occluding) {
-                float behindFraction = getInterpolatedFraction();
-                behindFraction = (float) Math.pow(behindFraction, 0.8f);
                 if (mClipsQsScrim) {
+                    float behindFraction = getInterpolatedFraction();
+                    behindFraction = (float) Math.pow(behindFraction, 0.8f);
                     mBehindAlpha = mTransparentScrimBackground ? 0 : 1;
                     mNotificationsAlpha =
                             mTransparentScrimBackground ? 0 : behindFraction * mDefaultScrimAlpha;
                 } else {
-                    mBehindAlpha =
-                            mTransparentScrimBackground ? 0 : behindFraction * mDefaultScrimAlpha;
-                    // Delay fade-in of notification scrim a bit further, to coincide with the
-                    // view fade in. Otherwise the empty panel can be quite jarring.
-                    mNotificationsAlpha = mTransparentScrimBackground
-                            ? 0 : MathUtils.constrainedMap(0f, 1f, 0.3f, 0.75f,
-                            mPanelExpansionFraction);
+                    if (mTransparentScrimBackground) {
+                        mBehindAlpha = 0;
+                        mNotificationsAlpha = 0;
+                    } else {
+                        // Behind scrim will finish fading in at 30% expansion.
+                        float behindFraction = MathUtils
+                                .constrainedMap(0f, 1f, 0f, 0.3f, mPanelExpansionFraction);
+                        mBehindAlpha = behindFraction * mDefaultScrimAlpha;
+                        // Delay fade-in of notification scrim a bit further, to coincide with the
+                        // behind scrim finishing fading in.
+                        // Also to coincide with the view starting to fade in, otherwise the empty
+                        // panel can be quite jarring.
+                        mNotificationsAlpha = MathUtils
+                                .constrainedMap(0f, 1f, 0.3f, 0.75f, mPanelExpansionFraction);
+                    }
                 }
                 mBehindTint = mState.getBehindTint();
                 mInFrontAlpha = 0;
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 c7a0582f00070..c0537a6dc4cfd 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
@@ -630,6 +630,7 @@ public class ScrimControllerTest extends SysuiTestCase {
 
     @Test
     public void transitionToUnlocked() {
+        mScrimController.setClipsQsScrim(false);
         mScrimController.setRawPanelExpansionFraction(0f);
         mScrimController.transitionTo(ScrimState.UNLOCKED);
         finishAnimationsImmediately();
@@ -645,14 +646,21 @@ public class ScrimControllerTest extends SysuiTestCase {
         ));
 
         // Back scrim should be visible after start dragging
-        mScrimController.setRawPanelExpansionFraction(0.3f);
+        mScrimController.setRawPanelExpansionFraction(0.29f);
         assertScrimAlpha(Map.of(
                 mScrimInFront, TRANSPARENT,
                 mNotificationsScrim, TRANSPARENT,
                 mScrimBehind, SEMI_TRANSPARENT));
 
+        // Back scrim should be opaque at 30%
+        mScrimController.setRawPanelExpansionFraction(0.3f);
+        assertScrimAlpha(Map.of(
+                mScrimInFront, TRANSPARENT,
+                mNotificationsScrim, TRANSPARENT,
+                mScrimBehind, OPAQUE));
+
         // Then, notification scrim should fade in
-        mScrimController.setRawPanelExpansionFraction(0.7f);
+        mScrimController.setRawPanelExpansionFraction(0.31f);
         assertScrimAlpha(Map.of(
                 mScrimInFront, TRANSPARENT,
                 mNotificationsScrim, SEMI_TRANSPARENT,