diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/HeadsUpTouchHelper.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/HeadsUpTouchHelper.java
index f57575de8675b..10c35af1cfb39 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/HeadsUpTouchHelper.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/HeadsUpTouchHelper.java
@@ -110,6 +110,8 @@ public class HeadsUpTouchHelper implements Gefingerpoken {
                     mInitialTouchX = x;
                     mInitialTouchY = y;
                     int expandedHeight = mPickedChild.getActualHeight();
+                    mPanel.setPanelScrimMinFraction((float) expandedHeight
+                            / mPanel.getMaxPanelHeight());
                     mPanel.startExpandMotion(x, y, true /* startTracking */, expandedHeight
                             + mNotificationsTopPadding);
                     mHeadsUpManager.unpinAll();
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
index 5ac436ae55ec4..495f0fda80075 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
@@ -1767,6 +1767,7 @@ public class NotificationPanelView extends PanelView implements
         mIsExpansionFromHeadsUp = false;
         mNotificationStackScroller.setTrackingHeadsUp(false);
         mExpandingFromHeadsUp = false;
+        setPanelScrimMinFraction(0.0f);
     }
 
     private void setListening(boolean listening) {
@@ -2317,7 +2318,7 @@ public class NotificationPanelView extends PanelView implements
         }
         x = Math.min(rightMost, Math.max(leftMost, x));
         setVerticalPanelTranslation(x -
-                (mNotificationStackScroller.getLeft() + mNotificationStackScroller.getWidth()/2));
+                (mNotificationStackScroller.getLeft() + mNotificationStackScroller.getWidth() / 2));
      }
 
     private void resetVerticalPanelPosition() {
@@ -2334,4 +2335,8 @@ public class NotificationPanelView extends PanelView implements
         mNotificationStackScroller.setStackHeight(stackHeight);
         updateKeyguardBottomAreaAlpha();
     }
+
+    public void setPanelScrimMinFraction(float minFraction) {
+        mBar.panelScrimMinFractionChanged(minFraction);
+    }
 }
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/PanelBar.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/PanelBar.java
index 552a0b21dbd0d..cf553ec4521f1 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/PanelBar.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/PanelBar.java
@@ -25,7 +25,7 @@ import android.widget.FrameLayout;
 
 import java.util.ArrayList;
 
-public class PanelBar extends FrameLayout {
+public abstract class PanelBar extends FrameLayout {
     public static final boolean DEBUG = false;
     public static final String TAG = PanelBar.class.getSimpleName();
     public static final void LOG(String fmt, Object... args) {
@@ -156,6 +156,8 @@ public class PanelBar extends FrameLayout {
         }
     }
 
+    public abstract void panelScrimMinFractionChanged(float minFraction);
+
     /**
      * @param panel the panel which changed its expansion state
      * @param frac the fraction from the expansion in [0, 1]
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBarView.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBarView.java
index b7e675d5c476e..dfd280aa09b65 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBarView.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBarView.java
@@ -40,6 +40,8 @@ public class PhoneStatusBarView extends PanelBar {
     PanelView mNotificationPanel;
     private final PhoneStatusBarTransitions mBarTransitions;
     private ScrimController mScrimController;
+    private float mMinFraction;
+    private float mPanelFraction;
 
     public PhoneStatusBarView(Context context, AttributeSet attrs) {
         super(context, attrs);
@@ -179,9 +181,23 @@ public class PhoneStatusBarView extends PanelBar {
         return mBar.interceptTouchEvent(event) || super.onInterceptTouchEvent(event);
     }
 
+    @Override
+    public void panelScrimMinFractionChanged(float minFraction) {
+        if (mMinFraction != minFraction) {
+            mMinFraction = minFraction;
+            updateScrimFraction();
+        }
+    }
+
     @Override
     public void panelExpansionChanged(PanelView panel, float frac, boolean expanded) {
         super.panelExpansionChanged(panel, frac, expanded);
-        mScrimController.setPanelExpansion(frac);
+        mPanelFraction = frac;
+        updateScrimFraction();
+    }
+
+    private void updateScrimFraction() {
+        float scrimFraction = Math.max(mPanelFraction - mMinFraction / (1.0f - mMinFraction), 0);
+        mScrimController.setPanelExpansion(scrimFraction);
     }
 }