Ubuntu causing a "CPU Fan Failed" problem on restart

Gilles Gravier Gilles at Gravier.org
Thu Jan 11 15:37:07 UTC 2007

Well... Then indeed probably something to do with the kernel and maybe 
the APM or ACPI configuration. Have you tried playing with settings of 
the kernel regarding ACPI in /boot/grub/menu.lst ?


Craig Hagerman wrote:
> 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
> slow).
> 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.
> Craig

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