I've narrowed the problem down to an oops when rebooting while X is running. This happens even when I reboot from the console by doing CTRL+ALT+F1 first.
Unfortunatly, I cannot capture the oops as it zooms by too quickly and I can no longer scroll up once it has crashed (how can I capture the oops?) When booted into "recovery mode" I can reboot fine. I've narrowed the problem down to presence of either the i915.ko or drm.ko kernel modules. This happens both with the 2.6.15-26-amd64-generic and 2.6.15-26-amd64-xeon kernels (this is and EMT_64 system). ** Changed in: xserver-xorg-driver-i810 (Ubuntu) Sourcepackagename: xserver-xorg-driver-i810 => linux-source-2.6.15 -- consistent crash on logout, restart or shutdown from X https://launchpad.net/bugs/58425 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs