Hello jwishnie, unlike sirjavabean, you have not yet decided to run the kernel with the "acpi=off" boot option. Since in the past (on Feisty and Gutsy) you have been able to run with acpi on, it is best to find a way to run with acpi on in Hardy as well.
People turn acpi off because of severe problems such as the machine hanging at boot. Turning acpi off, however, can cause certain hardware to go undetected, and it can cause this shutdown hanging problem.
So I would recommend avoiding the acpi=off option if you can.
You could try booting with kernel option "apm=power_off" and editing /etc/modules
to include
I don't think there is any harm in trying that.
Also, were you experiencing this problem in Hardy before the linux-image-2.6.24-17-generic kernel update?
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