--- Comment #5 from Alex Deucher <alexdeucher@gmai...> 2011-05-27 14:23:25 ---
Laptops don't generally use the onboard GPU fan controller and thermal sensor
since they usually have a single fan for both the GPU and the CPU. The fan and
thermal zones are generally exposed via ACPI or a vendor specific control. For
more info on the power management options in the driver see the page I linked
in comment #1.