--- xf86-video-siliconmotion-1.7.7.orig/src/smi_driver.c	2012-07-17 06:53:21.000000000 +0200
+++ xf86-video-siliconmotion-1.7.7/src/smi_driver.c	2014-03-14 18:39:37.307139846 +0100
@@ -1750,8 +1750,6 @@ SMI_ScreenInit(SCREEN_INIT_ARGS_DECL)
 		   "Done writing mode.  Register dump:\n");
     SMI_PrintRegs(pScrn);
 
-    miInitializeBackingStore(pScreen);
-
 #ifdef HAVE_XMODES
     xf86DiDGAInit(pScreen, (unsigned long)(pSmi->FBBase + pScrn->fbOffset));
 #endif