There might be a bug in the driver so that it doesn't honour the "NoDRI" option. Can you comment out (add a # in front of) the Load "dri" and Load "glx" lines in your xorg.conf? And attach the Xorg.0.log from after restarting X (log out and press ctrl-alt-backspace), so that we can check that DRI is disabled.
That might save you from the crashes. The downside is that the fancy screeensavers (and other 3D applications) won't be fancy anylonger... -- [r300] GL screen saver locks up entire system https://launchpad.net/bugs/60438 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
