I discovered that disabling the xorg "Composite" extension fixes this
issue for me (For the record, I was having this issue with the
commercial NVidia drivers, not Intel).
In your /etc/X11/xorg.conf add this, and then restart X:
Section "Extensions"
Option "Composite" "Disable"
EndSection
Of course, this means you can't use Unity or Compiz. I prefer to use
Metacity ("Classic Mode (No Effects)" mode) and this is fine with me!
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https://bugs.launchpad.net/bugs/740985
Title:
[gm45] screen artifacts when switching desktops with metacity
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