Same problem here. I notice that "acpi -V" says: "No support for device type: thermal". Gnome CPU-Frequency-applet shows 54% (1.0GHz out of 1.83GHz max) for both cores when idling.
Under similar conditions the OS X frequency is usually 1.5GHz. Yet, after running Ubuntu for a while the area around the power connector gets very hot (with or without power connected). When I then quickly reboot to OS X, the temperature is close to 70C, and then (still in OS X) slowly dropping to 55-60C. During this all I never hear a fan (but then my hearing ain't too good). -- MacBook gets extremely hot under Linux https://launchpad.net/bugs/52852 -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
