I want a machine that loses power to automatically reboot when power is available. I've looked around and haven't found a solution that works for 11.04.

Purportedly at one point you could do:

echo 'server_mode=1' > /proc/pmu/options

However, my install doesn't have a /proc/pmu folder. I assume this is still possible, where is the setting available?

EDIT:

If this isn't possible from the OS, is there a way to script these sorts of changes to BIOS or is this something that requires physical access to the machine on boot to manually edit the settings?.