I have a Thinkpad T61 that I just recently replaced the fan in (it was dying, and making loud grinding noises when running).
The new fan works fine, but it seems to pulse (turn on for ~5 seconds, then turn off for ~5 seconds, and repeat), which is rather annoying / irritating. This occurs in both windows and linux (ubuntu)
I don't think this was hapenning before I replace the fan, but it is hard to know since the fan was having other issues.
Is there some easy way to fix this, or to force the fan to a specific speed?