Comment 15 for bug 313525

Can you see what happens if you plug this modeline into your xorg.conf? If this makes the issue go away, then we can forward the issue usptream; perhaps the xserver is miscalculating things.

Modeline "1600x1200_75" 204.75 1600 1720 1888 2176 1200 1203 1207 1255 -hsync +vsync