diff --git a/libs/surfaceflinger/Layer.cpp b/libs/surfaceflinger/Layer.cpp
index f5a5a0b..f11bf18 100644
--- a/libs/surfaceflinger/Layer.cpp
+++ b/libs/surfaceflinger/Layer.cpp
@@ -515,6 +515,11 @@
         dirtyRegion.andSelf(visibleRegionScreen);
         outDirtyRegion.orSelf(dirtyRegion);
     }
+    if (visibleRegionScreen.isEmpty()) {
+        // an invisible layer should not hold a freeze-lock
+        // (because it may never be updated and thereore never release it)
+        mFreezeLock.clear();
+    }
 }
 
 void Layer::finishPageFlip()
diff --git a/opengl/libagl/copybit.cpp b/opengl/libagl/copybit.cpp
index a68750e..4cacc11 100644
--- a/opengl/libagl/copybit.cpp
+++ b/opengl/libagl/copybit.cpp
@@ -38,7 +38,7 @@
 #include <ui/Rect.h>
 
 
-#define DEBUG_COPYBIT true
+#define DEBUG_COPYBIT false
 
 // ----------------------------------------------------------------------------