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35a32c5
(Get the code!)
Okay, now to some questions... Stefano can you please try the following:
1. It looks like you're running compiz. Try turning off compiz (from login screen select Classic Desktop - no effects). If the corruption goes away after that, then I'm guessing a mesa/compiz 3d rendering bug. If it's still present then it's more X-y.
2. In the duped bug you mention you saw this since the introduction of the new stack. Do you recall more precisely when you started noticing it? We upgraded mesa, the kernel, and xserver all within a period of a couple weeks, and any one of those could cause a bug like this. If you know when exactly it started then that gives a strong clue what to look at first.
3. Do you have the 2.6.37 kernel still installed? If so, try booting that and reproducing the issue. If it can't be reproduced, then we know it's a kernel bug (probably drm), and if it can then we can at least get the kernel ruled out.