Re: [ACPI-sppt] Who controls cpu fan (Asus M2N) ?

From: "Rainer M." <[email protected]>

> > > When starting in the maximum performance mode, the fan gets switched on
> > > an off very often, and during compilation, it runs permanently.
> > >
> > > So, I'm seriously concerned as to whether battery mode is really healthy
> > > for my processor.
...
> I now found out the following:
> 1. I started the computer in "battery optimized" mode where the cpu fan won't
> ever start to run.
> 2. I did echo 0 > /proc/acpi/processor/CPU1/throttling to speedstep the cpu to
> 100%.
> 3. I started to compile something for half an hour
>
> And what happened? Instead of my processor catching fire or the cpu fan simply
> starting to run the cpu slows down in frequency to 300MHz in the end. But
> /proc/acpi/processor/CPU1/throttling still showed T0-mode (I found out using
> a bogomips-tool that the frequency gets scaled down).
> If then I stop compiling and wait for some minutes, the cpu's frequency
> increases again.
...
> And another question: Does anybody know how I should modify by dsdt to get the
> fan (rather than getting cpu frequency) controlled accoring to the
> temperature automatically???

What makes you think that the fan is NOT being controlled by temperature?  It's
a fact that when you reduce the cpu frequency, the cpu runs cooler.  It sounds
to me like the fan is functioning exactly as you want it.  What _isn't_ working
as you would like is that you don't seem to be able to control throttling if you
start on AC.  I think you're heading at this from the wrong direction.

derek



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