I have two PWM fan’s installed in my Shuttle KPC K45 being monitor with of sensor-applet in Ubuntu, which also monitors the CPU and hard drive temperature.
To begin run sensors-detect a utility which comes with lm-sensors
$ sudo apt-get install lm-sensors $ sudo sensors-detect
Answer YES to all the YES/no questions and allow sensors-detect to modify the /etc/modules, and reboot the computer.
To check the status of all the items lm-sensors can read.
$ sensors
To monitor the fan’s RPM from sensor-applet, select it from the “Sensors” tab.
Sensors Applet
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