Well apparently on Vista ( i don't have vista so can't test this ) with
the thinkpad drivers the fan doesn't spin up unless the machine gets hot
enough. Henrique doesn't really like userspace fan controls from what I
understand, however they are useful for testing.

I have confirmed that at least on a new Linux kernel you can pretty much
go about your business without the fan on at all (at low work loads) for
about half and hour before the system heats up to around 40-42 degrees
c. After which if you turn on the fan at  around 1739 (level 1) it can
pretty much cool the system back to 33-35 degrees in a few minutes.

When automatically controlled the fan never seems to drop back from 3371
after it has kicked in initially. I can only imagine that running the
fan at this pace leads to reduced battery life.

-- 
thinkpad-acpi X200 Thinkpad fan fails to spin down .
https://bugs.launchpad.net/bugs/380303
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