Comment 77 for bug 818830

I've been running with rc6 enabled for most of the precise development cycle, and I never observed the destkop hangs but have started seeing them recently. I can't say for certain whether or not they started with the 3.2.0-17.26 kernel. But the machine is very much alive when it happens; I can switch to a VT, the apps on my desktop still seem to be running (based on the fact that they still use some CPU), and I can get back to a functioning desktop with 'sudo service lightdm restart'. I'm seeing a strong correlation between these hangs and scrolling in a window, especially when I'm scrolling in chromium.

However, after upgrading this morning I'm not able to reproduce these hangs. I had a couple of pretty reliable ways of reproducing the issue, and neither of them are working. There were some libgl1-mesa updates when I upgraded, which could be related. So I'd suggest getting up-to-date on precise and seeing if the hangs are still reproducible (independently of testing Leann's kernel, so that it's clear what fixed the issue if it does go away).