ACPI Poweroff fails on HP OmniBook 500

[Adam Kessel <adam-/J5p37YCQWYytDrLOV7HaA@public.gmane.org>]

I posted this recently to lkml, but got no response, so I thought I would
report it here as well.[1]

In 2.4.22-rc2, ACPI poweroff worked fine on the HP OmniBook.

Since 2.4.22, all the way up to 2.4.23-pre8, the system fails to
shutdown--the process gets to "power off" and hangs there. It is
necessary to do a hard shut down to turn the system off.

There is no problem with rebooting.

Apparently this effects a number of HP laptops, although I have only
verified it on the OmniBook 500.[2]

This problem is not present in 2.6.0-test9.

I am using force=acpi as required since I have an older BIOS.  Apparently
the problem occurs in OmniBook laptops they have newer BIOSes as well.

I expect this is related to the Sony VAIO problem discussed this month on
this list as well.[3]

[1] http://www.ussg.iu.edu/hypermail/linux/kernel/0310.1/1625.html 
[2] http://zurich.ai.mit.edu/pipermail/omnibook/2003-September/002805.html
[3] http://article.gmane.org/gmane.linux.acpi.devel/4770


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