Power off not really working on system with EFI BIOS

[Aleksandar Milivojevic]

I've an Gateway FX6850-51u desktop.  This is an EFI system, and until few
Ubunutu releases ago, there was a kernel bug that caused kernel to crash on
shutdown or reboot.  This bug was fixed some time ago, and my system
reboots correctly (see
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/721576).  However on
shutdown kernel now only displays "Power down." message on console, but it
does not power down the system.  It's kind of odd.  Are there some settings
to fiddle with or diagnostic I could run?
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