diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index ce6c4a0..c68f5c1 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -407,8 +407,7 @@
 {
     ATRACE_CALL();
     switch (what) {
-        case MessageQueue::REFRESH: {
-//        case MessageQueue::INVALIDATE: {
+        case MessageQueue::INVALIDATE: {
             // if we're in a global transaction, don't do anything.
             const uint32_t mask = eTransactionNeeded | eTraversalNeeded;
             uint32_t transactionFlags = peekTransactionFlags(mask);
@@ -419,20 +418,16 @@
             // post surfaces (if needed)
             handlePageFlip();
 
-//            signalRefresh();
-//
-//        } break;
-//
-//        case MessageQueue::REFRESH: {
+            signalRefresh();
+
+        } break;
+
+        case MessageQueue::REFRESH: {
 
             handleRefresh();
 
             const DisplayHardware& hw(graphicPlane(0).displayHardware());
 
-//            if (mDirtyRegion.isEmpty()) {
-//                return;
-//            }
-
             if (CC_UNLIKELY(mHwWorkListDirty)) {
                 // build the h/w work list
                 handleWorkList();