how to adjust fan speed?

[Olga Urban]

On Thu, 2005-06-02 at 03:49, Klaasjan Brand wrote:
> > I just installed Linux on a former NT box. When it had NT, after boot up it
> > used to either slow down or shut down the fan, and there was almost no
> > noise. However, after I installed Linux, the noise persists and it's really
> > loud. How do I adjust the fan speed? Thank you. 
> 
> If the box supports ACPI you can set the fans to automatic mode:
> echo -n 3 > /proc/apci/fan/ <name> /state
> 
> You can also turn them off this way by setting the value to 0, but
> you'll risk overheating the cpu.
> 
Ok I upgraded the BIOS and now, ACPI is supported, but the
/proc/acpi/fan is empty. Do you know why it's empty and how can I change
that?