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.
 
This doesn't happen on my T42 - but then again the fan never stops under FreeBSD as it does under WinXP
 
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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