Interesting... Conrad, can you please install debug symbols:
sudo apt-get install libc6-dbg xserver-xorg-core-dbg libgl1-mesa-dri-dbg xserver-xorg-video-ati-dbg
Then reboot your machine, repro the bug and then collect xorg.log and xorg.log.old right _after_ you have reproduced the bug? (ideally using ssh while the machine is still at gdm). I wonder if the backtrace is identical in your case.
Interesting... Conrad, can you please install debug symbols: xorg-core- dbg libgl1-mesa-dri-dbg xserver- xorg-video- ati-dbg
sudo apt-get install libc6-dbg xserver-
Then reboot your machine, repro the bug and then collect xorg.log and xorg.log.old right _after_ you have reproduced the bug? (ideally using ssh while the machine is still at gdm). I wonder if the backtrace is identical in your case.