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.

-- 
after installing latest x-swat intel driver for Karmic, screen is sometimes 
corrupted
https://bugs.launchpad.net/bugs/396171
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