I've found the cause of this. I looked at my loaded modules for anything nvidia-specific and the first hit was nv_tco.
Looked at the source for this module (http://lxr.free- electrons.com/source/drivers/watchdog/nv_tco.c) and it seems to handle some hardware watchdog timer for Nvidia chipsets (as I have on my P5N-D). I disabled this module from loading, rebooted, and then rebooted again, and no more spontaneous reboots. I haven't tried any cold boots yet but I suspect that problem will be gone too. I guess maybe I should file a bug against this module... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/791089 Title: crash after rebooting or shutting down from Ubuntu 11.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/791089/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
