Confirming the problem with 2.6.20-11-generic in Feisty on a generic P4 desktop computer (I have fancontrol running though).
BTW, isn't this a dupe of a bug #22336 ? -- "critical temperature reached" with kernel 2.6.15-22-386 https://launchpad.net/bugs/44805 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
