I have a desktop with USB keyboard & mouse, and a motherboard (MSI
G31M3) that intermittently (around 1 boot in 15) fails to  initialise
USB correctly in the BIOS. Unplugging and re-plugging USB devices
doesn't help, the whole subsystem is non-functional, the only thing that
works is to reboot.

For those boots when I have no functioning input device, in Ubuntu 11.04
and before, the power button on the case was my input device, because it
could be pressed briefly, and the computer would then shut itself down
cleanly after 60 seconds, and then I could boot again normally, and the
USB problem was easily worked around. But from 11.10 onwards, this no
longer works, so all I can do is a forced power-off, with resulting
possible disk data corruption problems. It would be really good to have
this functionality back.

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https://bugs.launchpad.net/bugs/903306

Title:
  no reaction on shortly pressing power button

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