Based on the description of the symptoms, it sort of sounds like this
might be caused by an incorrect AGPMode setting, which is relevant when
DRI is enabled. You should test if changing this makes the issue go
away. In your /etc/X11/xorg.conf set AGPMode to various values like
this:
Section "De
** Changed in: xserver-xorg-video-ati (Ubuntu)
Importance: Undecided => High
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: Confirmed => Triaged
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Corrupted screen
https://bugs.launchpad.net/bugs/557433
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Bugs
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: New => Confirmed
--
Corrupted screen
https://bugs.launchpad.net/bugs/557433
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** Package changed: xorg (Ubuntu) => xserver-xorg-video-ati (Ubuntu)
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Corrupted screen
https://bugs.launchpad.net/bugs/557433
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htt
** Attachment added: "Screenshot"
http://launchpadlibrarian.net/43365787/Capture.png
** Attachment added: "BootDmesg.txt"
http://launchpadlibrarian.net/43365287/BootDmesg.txt
** Attachment added: "Dependencies.txt"
http://launchpadlibrarian.net/43365288/Dependencies.txt
** Attachment a
