diff --git a/include/android/input.h b/include/android/input.h
index f2befa9e..c8ac938 100644
--- a/include/android/input.h
+++ b/include/android/input.h
@@ -428,6 +428,7 @@
 enum {
     AINPUT_SOURCE_CLASS_MASK = 0x000000ff,
 
+    AINPUT_SOURCE_CLASS_NONE = 0x00000000,
     AINPUT_SOURCE_CLASS_BUTTON = 0x00000001,
     AINPUT_SOURCE_CLASS_POINTER = 0x00000002,
     AINPUT_SOURCE_CLASS_NAVIGATION = 0x00000004,
@@ -446,6 +447,7 @@
     AINPUT_SOURCE_STYLUS = 0x00004000 | AINPUT_SOURCE_CLASS_POINTER,
     AINPUT_SOURCE_TRACKBALL = 0x00010000 | AINPUT_SOURCE_CLASS_NAVIGATION,
     AINPUT_SOURCE_TOUCHPAD = 0x00100000 | AINPUT_SOURCE_CLASS_POSITION,
+    AINPUT_SOURCE_TOUCH_NAVIGATION = 0x00200000 | AINPUT_SOURCE_CLASS_NONE,
     AINPUT_SOURCE_JOYSTICK = 0x01000000 | AINPUT_SOURCE_CLASS_JOYSTICK,
 
     AINPUT_SOURCE_ANY = 0xffffff00,
diff --git a/libs/gui/BufferQueue.cpp b/libs/gui/BufferQueue.cpp
index d93c067..41ee1be 100644
--- a/libs/gui/BufferQueue.cpp
+++ b/libs/gui/BufferQueue.cpp
@@ -995,7 +995,7 @@
 }
 
 status_t BufferQueue::drainQueueLocked() {
-    while (mSynchronousMode && !mQueue.isEmpty()) {
+    while (mSynchronousMode && mQueue.size() > 1) {
         mDequeueCondition.wait(mMutex);
         if (mAbandoned) {
             ST_LOGE("drainQueueLocked: BufferQueue has been abandoned!");
@@ -1012,7 +1012,7 @@
 status_t BufferQueue::drainQueueAndFreeBuffersLocked() {
     status_t err = drainQueueLocked();
     if (err == NO_ERROR) {
-        if (mSynchronousMode) {
+        if (mQueue.empty()) {
             freeAllBuffersLocked();
         } else {
             freeAllBuffersExceptHeadLocked();
diff --git a/libs/utils/RefBase.cpp b/libs/utils/RefBase.cpp
index 2b39bce..3dac89e 100644
--- a/libs/utils/RefBase.cpp
+++ b/libs/utils/RefBase.cpp
@@ -15,6 +15,7 @@
  */
 
 #define LOG_TAG "RefBase"
+#define LOG_NDEBUG 0
 
 #include <utils/RefBase.h>
 
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 5939dc8..184f47e 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -2708,15 +2708,17 @@
     glClearColor(0,0,0,1);
     glClear(GL_COLOR_BUFFER_BIT);
 
-    const Vector< sp<Layer> >& layers(hw->getVisibleLayersSortedByZ());
+    const LayerVector& layers( mDrawingState.layersSortedByZ );
     const size_t count = layers.size();
     for (size_t i=0 ; i<count ; ++i) {
         const sp<Layer>& layer(layers[i]);
-        const uint32_t z = layer->drawingState().z;
-        if (z >= minLayerZ && z <= maxLayerZ) {
-            if (filtering) layer->setFiltering(true);
-            layer->draw(hw);
-            if (filtering) layer->setFiltering(false);
+        const Layer::State& state(layer->drawingState());
+        if (state.layerStack == hw->getLayerStack()) {
+            if (state.z >= minLayerZ && state.z <= maxLayerZ) {
+                if (filtering) layer->setFiltering(true);
+                layer->draw(hw);
+                if (filtering) layer->setFiltering(false);
+            }
         }
     }