diff -r 3b1da2848fc7 -r d3bac044e0f0 src/plugins/gfxdrivers/directfb/qdirectfbwindowsurface.cpp
--- a/src/plugins/gfxdrivers/directfb/qdirectfbwindowsurface.cpp	Fri Feb 19 23:40:16 2010 +0200
+++ b/src/plugins/gfxdrivers/directfb/qdirectfbwindowsurface.cpp	Fri Mar 12 15:46:37 2010 +0200
@@ -378,9 +378,6 @@
         return;
     }
     screen->flipSurface(dfbSurface, flipFlags, region, offset);
-    if (noSystemBackground) {
-        dfbSurface->Clear(dfbSurface, 0, 0, 0, 0);
-    }
 #else
     setOpaque(windowOpacity != 0xff);
     if (mode == Offscreen) {