Comment 38 for bug 126369

I've been discussing with the ACPI maintainer, I'll do a couple of tests with upstream kernels and file a bugzilla.kernel.org report. In the meantime, he's secured a T61 and will investigate the issues ASAP. It could be a BIOS bug tho. Once we've found the root cause and possible workaround, one can look into backporting to gutsy I suppose.