Comment 30 for bug 396171

Just running xrandr doesn't do anything. the output is:
$ xrandr
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 8192 x 8192
VGA1 disconnected (normal left inverted right x axis y axis)
LVDS1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 287mm x 215mm
   1024x768 60.0*+ 85.0 75.0 70.1 60.0* 50.0
   832x624 74.6
   800x600 85.1 72.2 75.0 60.3 56.2
   640x480 85.0 72.8 75.0 59.9
   720x400 85.0
   640x400 85.1
   640x350 85.1
DVI1 disconnected (normal left inverted right x axis y axis)

Any refresh rate of anything over 60Hz cause the corruption - in this case the display configuration offers me, as can be seen, 70Hz, 75Hz and 85Hz refresh rates that cause problems.