--- hw/xfree86/fbdevhw/fbdevhw.c.orig	2007-09-03 20:48:47.000000000 +0000
+++ hw/xfree86/fbdevhw/fbdevhw.c	2007-09-03 20:53:12.000000000 +0000
@@ -245,7 +245,8 @@
 		set->green.length == req->green.length &&
 		set->blue.length == req->blue.length &&
 		set->xres == req->xres && set->yres == req->yres &&
-		set->pixclock == req->pixclock &&
+		/* xenfb sets pixclock to 0 (Novell Bug #285523) */
+		((set->pixclock == req->pixclock) || !set->pixclock) &&
 		set->right_margin == req->right_margin &&
 		set->hsync_len == req->hsync_len &&
 		set->left_margin == req->left_margin &&