Index: radeon_driver.c
===================================================================
RCS file: /cvs/xorg/xc/programs/Xserver/hw/xfree86/drivers/ati/radeon_driver.c,v
retrieving revision 1.23
diff -u -r1.23 radeon_driver.c
--- radeon_driver.c	11 Oct 2004 23:20:26 -0000	1.23
+++ radeon_driver.c	20 Oct 2004 03:53:03 -0000
@@ -1344,12 +1344,17 @@
 static Bool RADEONGetLVDSInfo (ScrnInfoPtr pScrn)
 {
     RADEONInfoPtr info     = RADEONPTR(pScrn);
+    RADEONEntPtr pRADEONEnt   = RADEONEntPriv(pScrn);
+
+    if (!RADEONGetLVDSInfoFromBIOS(pScrn)) {
+        /* when there is DDC, let driver collect info from EDID.
+         */
+        if (pRADEONEnt->MonInfo1) return TRUE;
 
-    if (!RADEONGetLVDSInfoFromBIOS(pScrn))
         RADEONGetPanelInfoFromReg(pScrn);
+    }
 
     if (info->DotClock == 0) {
-        RADEONEntPtr pRADEONEnt   = RADEONEntPriv(pScrn);
         DisplayModePtr  tmp_mode = NULL;
         xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
                    "No valid timing info from BIOS.\n");
@@ -1422,6 +1427,9 @@
             RADEONGetPanelInfoFromReg(pScrn);
         }
     } else {
+        info->DotClock = 0;
+        info->PanelXRes = 0;
+        info->PanelYRes = 0;
 
         if(info->DisplayType == MT_LCD) {
             RADEONGetLVDSInfo(pScrn);