Ubuntu causing a "CPU Fan Failed" problem on restart

Craig Hagerman craighagerman at gmail.com
Thu Jan 11 14:47:16 UTC 2007

On 1/11/07, Gilles Gravier <Gilles at gravier.org> wrote:
> Craig,
> You may just be hitting a coincidence.
> Have you tried blowing dry clean air on the CPU fan? Sometimes, after a
> bit of use, dust accumulates around the fans, often under the fan,
> around the axis... and the friction is enough to slow down (sometimes
> even halt) the fan's engine (these engines are extremely weak to use as
> little energy as possible). Simply blowing air from a dry air bottle
> might fix your issue. :)
> I've seen that happen several times.
> Gilles.

No, there is no problem with dust. I have cleaned the insides very
well. Anyway, that fan doesn't actually get much use most of the time
anyway. I am using AMD's cool 'n' quiete via lm-sensors so the CPU
automatically steps up or down as needed (mostly down) and the CPU fan
spins down or stops as needed (most of the time it is stopped or very

That can not be the problem anyway since the "CPU Fan Failed" error
ONLY happens when rebooting from Ubuntu. It does NOT happen when I
reboot from either the Windows partition or another Linux partition.
That is - when I restart from any other OS, it stops and restarts just
fine every single time. When I try to restart Ubuntu I get an audio
warning about the CPU Fan every single time.


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