Comment 12 for bug 38181

I'm experiencing this problem after upgrading from breezy to dapper (release).

Using the same xorg.conf that I've been running with for the whole of breezy my laptop would lockup hard (have to hold down the reset button to restart) after anything between 2 and 5 minutes. It usually ocurred when running something like evolution or firefox and I can repro every time by dragging and xterm over the top of evolution. Some relevant versions:
ii xserver-xorg-c 1.0.2-0ubuntu1 X.Org X server -- core server
ii xserver-xorg-d 6.5.7.3-0ubunt X.Org X server -- ATI display driver
kernel was linux-image-2.6.15-23-686

I tried commenting out the dri, GLcore and glx load modules in my xorg.conf one by one but each time I'd still get a lockup. Finally I tried rebooting with a 2.6.12-10-686 image and that seems to have solved the problem. I've been running for more than 12 hours with no repeat of the lockups. I haven't tried adding back the load modules in my xorg.conf but I may give that a go.

I'm using a pretty old Dell Latitude C510/C610 with a Radeon Mobility (16mb). I have no onboard wireless, bluetooth or anything fancy which may have caused problems with newer kernels.

Not sure if there are any release notes associated with the new release of ubuntu but something like this should definitely be in there. Its put a big dampner on dapper so far for me.