--- xorg-server-1.7.6/exa/exa_classic.c.orig	2010-06-08 06:09:48.626645082 +0200
+++ xorg-server-1.7.6/exa/exa_classic.c	2010-06-08 06:14:23.146669781 +0200
@@ -247,10 +247,12 @@
     ExaPixmapPriv(pPixmap);
     Bool ret;
 
+    void* old_ptr = pPixmap->devPrivate.ptr;
+
     if (pExaScr->info->PixmapIsOffscreen) {
 	pPixmap->devPrivate.ptr = ExaGetPixmapAddress(pPixmap);
 	ret = pExaScr->info->PixmapIsOffscreen(pPixmap);
-	pPixmap->devPrivate.ptr = NULL;
+	pPixmap->devPrivate.ptr = old_ptr;
     } else
 	ret = (pExaPixmap->offscreen && pExaPixmap->fb_ptr);