I've just compiled 2.6.20.3-vanilla on my gentoo partition and experienced a similar problem. This bug seems to affect vanilla kernels too.
-- kernel 2.6.20-xx incorrectly claims processor overheating https://launchpad.net/bugs/94862 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
