dmesg shows this was using the old speedstep cpufreq driver. Your system should now be using the acpi-cpufreq driver due to a fix that went in since this bug was reported.
** Changed in: linux-source-2.6.20 (Ubuntu) Importance: Undecided => Medium Assignee: (unassigned) => Ben Collins Status: Unconfirmed => Fix Released -- CPU at maximum speed when connected to AC https://launchpad.net/bugs/84883 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs