diff -up xf86-video-mach64-6.8.0/src/atipreinit.c.jx xf86-video-mach64-6.8.0/src/atipreinit.c
--- xf86-video-mach64-6.8.0/src/atipreinit.c.jx	2008-03-26 02:09:43.000000000 -0400
+++ xf86-video-mach64-6.8.0/src/atipreinit.c	2009-07-15 15:34:10.000000000 -0400
@@ -584,7 +584,7 @@ ATIPreInit
         else
         {
             i = Support24bppFb | Support32bppFb;
-            DefaultDepth = 0;
+            DefaultDepth = 16;
         }
 
         if (!xf86SetDepthBpp(pScreenInfo, DefaultDepth, 0, 0, i))