If any one needs more information on this please let me know, because I have the same issue. I started seeing this after 2.6.17 kernel version. With 2.6.16 I have never seen this. And its there in all distro not just Ubuntu. I have the latest version of Feisty installed with kernel 2.6.20-12, but I still see them.
ACPI: Unable to turn cooling device [e6c34dec] 'on' -- ACPI: Unable to turn cooling... https://launchpad.net/bugs/63550 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
