acpi=force never worked under the older kernel (2.6.15) for me, and doesn't with the newer one, either. noapic doesn't do much on my hardware, either and nor does pnpbios=off. Still no joy as of 22nd October.
-- [edgy] kernel panic after last update https://launchpad.net/bugs/61848 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs