Comment 67 for bug 91966

The fix from Jaime worked for me too!

A developer over at freedesktop.org suggested trying version 2.2 of the xserver-xorg-video-intel driver. Supposedly there are some suspend/resume fixes.

I would try myself but I can't seem to backport it properly to gutsy.

Heres the link to the bug report: http://bugs.freedesktop.org/show_bug.cgi?id=12667#c8