i have a x300 and the same problem exists on my system. Option "UseInternalAGPGART" "no" does not work on my system. the problem doesn't occur every single time, but around 75% of the time, it happens when i either log off, restart, or shut down.
the problem is very annoying and i would very much like to see a working fix. i guess i'll just stick with windows for now until this gets resolved.... -- Lockup problems with both the free xorg ATI driver and the proprietary fglrx driver, using various ATI cards https://launchpad.net/bugs/30447 -- kubuntu-bugs mailing list kubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs