lm_sensors
http://secure.netroedge.com/~lm78/ http://people.kldp.org/~eunjea/lm_sensors.php
hardware (CPU temp, fan rpm...) monitoring tool. It can control maximun fan rpm.
Concerned post
Setting in UbuntuLinux
$ sudo apt-get install sensord $ sensors-detect $ sudo modprobe XXX (previous results) $ sensors