Comment 4 for bug 213754

Have you tried to play with some kernel parameter related to acpi? such as acpi=off, pnpbios=off, pci=noacpi ...etc?

According to wcgbg, the bug started from 2.6.24-15-generic, and when I check the change log. There is a change made related to ACPI.
http://changelogs.ubuntu.com/changelogs/pool/main/l/linux/linux_2.6.24-16.30/changelog

 linux (2.6.24-15.26) hardy; urgency=low

  [Colin Ian King]

  * airprime.c supports more devices
    - LP: #208250

  [Kees Cook]

  * AppArmor: get latest batch of upstream fixes into Hardy (svn 1160)

  [Stefan Bader]

  * ACPI: fix boot oops regression in kernel
    - LP: #207014

Also, perhaps tried to update the BIOS and see if it helps.