Given that the issue regressed between kernel versions 2.6.32-20 and 2.6.32-21 that really suggests it's a kernel bug, not X, especially since you see the corruption so early in the boot process (maybe before X has even started).
Like I mentioned, I would upstream this however you have to test the latest development version (maverick) first. If you are not interested in doing this, and just wish to get your system running, I would recommend using the technical support channels. ** Package changed: xserver-xorg-video-ati (Ubuntu) => linux (Ubuntu) ** Changed in: linux (Ubuntu) Status: Incomplete => New -- vertical coloured lines on bootup dell inspiron 1501 https://bugs.launchpad.net/bugs/572521 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs