fan always near 4K rpm on thinkpad t42

The fan starts at the middle speed and never stops. I thought that was slightly strange with the cpu temperature around 42. powerd is enabled and all the cooling seems to be working with acpi_ibm loaded. Is there some odd default with the automatic fan control that makes it work at 3 or 4 fan_level?

I'm suspicious that the BIOS is at fault but would like some confirmation before flashing.

Failing that I may need to write a fan control script for this.
 
Actually, if the ac adapter is plugged in then the fan does stop at some points. If I unplug the adapter and plug it back in the fan never stops.
 
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