[Sorry for the duplicate mail sent earlier to debian-kernel] This whole bug really looks like #615598. This might be a bug in nouveau or in the kernel. Did the initial "breakage" of the screens occur with 2.6.38? If so, you may want to try fixing your EDID info has explained in a similar bug report[1], but be careful, it may cause more harm if something goes wrong. If you decided to do so, please check if the corruption appears again. [1] https://bugs.freedesktop.org/show_bug.cgi?id=34554
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