Index: radeon_driver.c
===================================================================
RCS file: /cvs/xorg/xc/programs/Xserver/hw/xfree86/drivers/ati/radeon_driver.c,v
retrieving revision 1.64
diff -u -r1.64 radeon_driver.c
--- radeon_driver.c	29 Jul 2005 19:45:14 -0000	1.64
+++ radeon_driver.c	6 Aug 2005 01:46:23 -0000
@@ -2917,7 +2917,7 @@
     xf86MonPtr      ddc  = pScrn->monitor->DDC;
     DisplayModePtr  p;
 
-    if (info->UseBiosDividers && info->DotClock != 0)
+    if ((info->UseBiosDividers && info->DotClock != 0) || (ddc == NULL))
        return;
 
     /* Go thru detailed timing table first */