Found the reason: When suspending my system, the hardware-watchdog is dying and after resume I can see watchdog <defunct> in the process list. By simply trying to restart watchdog, the system resets. So at the moment I purged the watchdog package, but this must be a bug in the watchdog kernel code.
Because 2.6.27 is rc9 at the moment: Do you ask upstream for a fix or should I contact lkml for this issue? iTCO_wdt: Intel TCO WatchDog Timer Driver v1.03 (30-Apr-2008) Problem: Dying on suspend; By restarting service, watchdog triggers reboot -- [intrepid] suspend/hibernate _is_ working, but a shutdown after this is broken https://bugs.launchpad.net/bugs/274379 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs