Shutdown hangs at: "ACPI_power_off_called".

[Daniel Robitaille]

> I have tried the following parameters in Grub at bootup: "noapic",
> "pci=noacpi", "acpi=off", "acpi=force" and "nolapic"; I have been
> viewing and trying to follow any email that sounded like it pertained to
> this shutdown problem; Shutdown still hangs at "acpi power off called"
> 

it probably doesn't directly apply to your problem, but some older
desktop/laptop had to use apm instead of acpi to get a proper
poweroff/shutdown (simply add the word "apm" in the file
/etc/modules).   But that was in systems where there was no acpi,
which I don't think is your problem here.