Jarlath,
Have you tried the kernel boot option specified in the previous comment by
Michal?
On older PCs (like Michal's) ACPI is disabled by default because it didn't
physically exist in most PCs back around 1999. If a PC from this era does
happen to have ACPI functionality then you must force the kernel to use it by
using the kernel boot option acpi=force. Gutsy carries a warning about this at
boot time if it discovers an older PC.
If you have a modern PC and are having similar trouble then you should consider
filing a new bug report.
** Changed in: linux-source-2.6.15 (Ubuntu)
Status: New => Incomplete
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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Pressing power button hangs the system with 2.6.15-20-686
https://bugs.launchpad.net/bugs/40243
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