driver/xf86-video-ati/bstore.patch

--- src/radeon_driver.c Wed Feb 20 11:40:18 2013
+++ src/radeon_driver.c Wed Feb 20 11:40:30 2013
@@ -3756,7 +3756,6 @@
     /* Backing store setup */
     xf86DrvMsgVerb(pScrn->scrnIndex, X_INFO, RADEON_LOGLEVEL_DEBUG,
           "Initializing backing store\n");
-    miInitializeBackingStore(pScreen);
     xf86SetBackingStore(pScreen);

     /* DRI finalisation */
--- src/radeon_kms.c    Wed Feb 20 11:40:22 2013
+++ src/radeon_kms.c    Wed Feb 20 11:40:37 2013
@@ -1039,7 +1039,6 @@
     /* Backing store setup */
     xf86DrvMsgVerb(pScrn->scrnIndex, X_INFO, RADEON_LOGLEVEL_DEBUG,
           "Initializing backing store\n");
-    miInitializeBackingStore(pScreen);
     xf86SetBackingStore(pScreen);