I just spoke with Alex Deucher about this, and showed the screenshot.
He's aware of the problem but doesn't have an idea about what may be
causing it or how to fix it. It seems to have been an issue for a while
in the -ati driver. It's probably unrelated to the kernel version (if
you can prove otherwise, let us know).
Can people experiencing this problem please do the following tests?
1. Try disabling tiling by adding Option "ColorTile" "false" to your driver
section.
2. Try disabling DRI by adding Disable "DRI" in your module section
3. Try both the above together
Also, please attach your /etc/X11/xorg.conf and /var/log/Xorg.0.log in
each of the above cases. Also include the output of lspci -vvnn.
More screenshots/photos of screens showing the garbage could also be
quite valuable, so please also attach those if you have them.
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: Confirmed => Incomplete
** Bug watch added: freedesktop.org Bugzilla #11399
https://bugs.freedesktop.org/show_bug.cgi?id=11399
** Also affects: xorg-server via
https://bugs.freedesktop.org/show_bug.cgi?id=11399
Importance: Unknown
Status: Unknown
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Screen displays garbage
https://bugs.launchpad.net/bugs/133192
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