Patch by Torsten Kaiser <x11@ariolc.dyndns.org>
taken from https://bugs.freedesktop.org/show_bug.cgi?id=45623

diff -ur a/hw/xfree86/modes/xf86EdidModes.c b/hw/xfree86/modes/xf86EdidModes.c
--- a/hw/xfree86/modes/xf86EdidModes.c	2012-05-17 19:09:03.000000000 +0200
+++ b/hw/xfree86/modes/xf86EdidModes.c	2012-05-30 01:27:06.000000000 +0200
@@ -723,7 +723,13 @@
     1920, 1200, 75, 0}, {
     1920, 1200, 85, 0}, {
     1920, 1440, 60, 0}, {
-1920, 1440, 75, 0},};
+1920, 1440, 75, 0},
+    /* fill up last byte */
+    { 0,0,0,0 },
+    { 0,0,0,0 },
+    { 0,0,0,0 },
+    { 0,0,0,0 },
+};
 
 static DisplayModePtr
 DDCModesFromEstIII(unsigned char *est)
@@ -732,10 +738,11 @@
     int i, j, m;
 
     for (i = 0; i < 6; i++) {
-        for (j = 7; j > 0; j--) {
+        for (j = 7; j >= 0; j--) {
             if (est[i] & (1 << j)) {
                 m = (i * 8) + (7 - j);
-                modes = xf86ModesAdd(modes,
+                if (EstIIIModes[m].w)
+                        modes = xf86ModesAdd(modes,
                                      FindDMTMode(EstIIIModes[m].w,
                                                  EstIIIModes[m].h,
                                                  EstIIIModes[m].r,