I can't see anything obvious, but your BIOS is ancient by ACPI standards. Have you checked for an update? Many of the BIOS vendors didn't get ACPI right (some still don't).
** Changed in: linux-source-2.6.20 (Ubuntu)
Assignee: Tim Gardner => Ubuntu Kernel ACPI Team
Status: Needs Info => Confirmed
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Computer doesn't power off after shutdown (Feisty)
https://launchpad.net/bugs/96236
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