diff -rupN xf86-video-trident-1.3.6-orig/src/trident_driver.c xf86-video-trident-1.3.6/src/trident_driver.c
--- xf86-video-trident-1.3.6-orig/src/trident_driver.c	2013-03-09 15:26:15.618404327 +0100
+++ xf86-video-trident-1.3.6/src/trident_driver.c	2013-03-09 15:26:51.242622434 +0100
@@ -56,7 +56,6 @@
 
 #include "mipointer.h"
 
-#include "mibstore.h"
 #include "shadow.h"
 #include "trident.h"
 #include "trident_regs.h"
@@ -3037,7 +3036,6 @@ TRIDENTScreenInit(SCREEN_INIT_ARGS_DECL)
     	TridentAccelInit(pScreen);
     }
 
-    miInitializeBackingStore(pScreen);
     xf86SetBackingStore(pScreen);
 
     /* Initialise cursor functions */