Enable CPU fan always on

Posted by Gundars Meness on Super User See other posts from Super User or by Gundars Meness
Published on 2013-08-02T15:19:41Z Indexed on 2013/08/02 15:42 UTC
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Filed under:

laptop

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cpu

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fan

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cooling

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overheating

I am using 3 years old overheating laptop and I want my CPU fan to be spinning 24/7 regardless of the consequences. How to make it spin?

The problem is that CPU & GPU heats up to 68°C (154 F) right after boot and never goes down, because CPU fan is not spinning full throttle. It starts spinning faster when temperature goes over 70°C and stops when it reaches seventy again. When doing heavy work on databases, it gets from 70 to 90 in no-time and automatically powers off. Bios does not contain any "fan spin 100%" options, just "spin slowly all the time" and "auto" which is more useless than the first one since my fan doesn't have pwm wire.

Currently I'm solving this with cooling stand (3x5V), but it isn't much of a help. I would rather use the CPU fan since it is the only fan directly responsible for cooling down CPU/GPU.

But how to make it spin 100% all the time? Should I attach it's red power wire to motherboard to get constant 5V (is there such option?), or is there an option to control it via software?

Laptop: Samsung R528 2.3 GHz Intel i3 with Nvidia GeForce 310M
Bios: Phoenix 03KT.M003.20100622.KSJ (and that is latest update)
OS: Ubuntu 12.04.2 LTS with 3.2.0.51 kernel
CPU fan: Image/Description Has 5V 0,4A and only 3 pins, no pwm.

P.S. Yes, I did clean everything with alcohol, freed the air vents, changed thermal paste etc; that reduced temperature by 4 degrees.

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