To get an idea where in the code the problem is, could you try disabling a few 
things (only one at a time) to see if it makes the problem go away:
- System -> Preferences -> Appearance -> Visual Effects: Set to none
- In xorg.conf "Device" section, one of the following lines at a time:
  Option "NoAccel" "true"
  Option "Tiling" "false"
  Option "DRI" "false"

-- 
[i855] screen corruption when switching resolution
https://bugs.launchpad.net/bugs/391084
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