[SLE] Cautionary Tales: lm_sensors for beginners

For the first time since starting to use Linux, I decided that I will go really high tech and start using lm_sensors on SUSE 10.1.

I used the /usr/sbin/sensors- detect command and let it find them and then "do its thing" to create the lm_sensors configuration file. Because it was time for me to go biddie-byes I didn't reboot but shut the system down and went to bed.

This morning I booted-up the system and suddenly I was hit by a very high pitched sound coming from the computer. Ear-splitting it was :-( and to me this is a no-no 'cause I suffer from tinnitus.

Took a while to pinpoint the sound as coming from the rheostat on the (front) panel which controls the speed of the Gigabyte CPU heatsink fan.

There was not a murmur when I booted into the "other" OS so it was something in SUSE. Finally[0] dawned on me that the only thing that changed between "no noise" and "hight-pitched noise" was the creation of the lm_sensors file in /etc/sysconfig. I renamed lm_sensors file, rebooted and the sound vanished.

So, if you configure lm_sensors and suddenly find that there is a very high-pitched sound coming from the innards of your computer case then you now know what you can try and do to get rid of it.

[0] I have another rheostat on another (front) panel which controls the speed of the PSU and case fans which occasionally makes a similar noise if the speed of the case fans drops too low, and just gently tapping the control knob gets rid of the noise. My initial reaction to the above was that it was this that was causing the high-pitched sound.


Cheers.

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