This sounds like a bug in the XAA acceleration architecture, which is
resolved by specifying AccelMethod EXA in your xorg.conf. Note that in
Intrepid EXA has some performance regression compared with XAA, so it
may or may not be worth switching, but for Jaunty, EXA performance is
much improved, and we moved to EXA by default.
If by chance you still reproduce the problem in Karmic, feel free to
reopen the bug; please attach a new Xorg.0.log in this case.
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: New => Fix Released
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[Intrepid] Screen artifacts on resume with Radeon Mobility X1400 on Thinkpad T60
https://bugs.launchpad.net/bugs/272969
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