Comment 30 for bug 1057532

Anything else for me to try out?

I've been thinking... It could be that the bug appeared because of an update to the video drivers in the xorg-edgers repository I'm using.
Some Ubuntu-specific modification to the kernel, which isn't present in the mainline kernel, doesn't go well with the current xorg-edgers video drivers (or at least the video drivers at the time at which I did the kernel update).
That would explain why I didn't see the bug with an earlier version of the 3.5 kernel, because it wouldn't show itself before the video driver update.

Current version of "xserver-xorg-video-radeon" (part of the "xserver-xorg-video-ati" set) in xorg-edgers is:
1:6.99.99+git20120928.e8cb0b72-0ubuntu0sarvatt

The driver version in the main Quantal repositories is:
1:6.99.99~git20120913.8637f772-0ubuntu1