I have tried to fix this issue with module disabled method as John Mason
has described in previous comment. The problem was gone after this
command in terminal:
sudo sh -c "echo 'blacklist nv_tco' >> /etc/modprobe.d/blacklist-
watchdog.conf"
...and then reboot.
It add in config file "blacklist-watchdog.conf" a new line 'blacklist nv_tco'
which prevent nv_tco module to load at system startup.
Here was a same problem with strange reboots at BIOS startup after Ubuntu 11.04
shutdown and restart on Asus motherboard with Nvidia 790i SLI chipset.
There were one difference compared between Ubuntu 11.04 shutdown and restart:
[shutdown] sudden auto reboot at BIOS start after power on, then error
message appears at second BIOS check, because first boot was interrupted.
[restart] no matter what you do when the current state is BIOS, "boot
devise menu chooser" or another OS, after around one minute computer will
reboot by itself.
This is looks like not a Unity bug.
Now Ubuntu works fine but I'm not sure what else this method can affect.
Thanks to John Mason.
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https://bugs.launchpad.net/bugs/776803
Title:
Natty does not shut down cleanly (enough for my BIOS)
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