------- radeon_mergedfb.c -------
--- /tmp/geta502	Mon Jun 19 13:36:46 2006
+++ /tmp/getb502	Mon Jun 19 13:36:46 2006
@@ -209,6 +209,12 @@
     mode->VSyncEnd += dy;
     mode->VTotal += dy;
 
+    /* This is needed for not generating negative refesh rates in xrandr with the
+       faked DotClock below 
+     */
+    if (!(mode->VRefresh))
+        mode->VRefresh = mode->Clock * 1000.0 / mode->HTotal / mode->VTotal + 0.5;
+
      /* Provide a sophisticated fake DotClock in order to trick the vidmode
       * extension to allow selecting among a number of modes whose merged result
       * looks identical but consists of different modes for CRT1 and CRT2