On Jun 10 12:09:26, Joachim Schipper wrote:
> On Wed, Jun 10, 2009 at 11:53:39AM +0200, Jan Stary wrote:
> > Scenario: 4.5 on MSI Wind PC, everything works. I use this machine
> > because it is relatively low-power and quiet.
> >
> > The fan rotation changes with how much the CPU is used
> > (could someone translate this into the real thing please?),
> > without me doing anything about it on the OS level.
> >
> > Unless I run something heavy, such as launching mozilla, the fan keeps
> > pretty quiet (below the level of noise that would annoy me), but still,
> > it could be quiter. Is there a way to control the fan RPM from the OS?
> > (Unsurprisingly, hw.sensors.adt0.fan0 is readonly.)
>
> This is not an answer to your query, but are you sure that turning off
> the cooling for the CPU is a good idea? It does turn on for a reason...
I don't want to turn it off. I want to lower the rotation speed a bit.
> You may want to investigate hw.setperf, which may be used to put the CPU
> in a low-power (and -performance) state. Try sysctl hw.setperf=0 (the
> lowest possible state).
I never tried hw.setperf=0; but with hw.setperf=90, then 80, then 70,
the fan actually starts to rotate _faster_ (thus becoming noisier).
Jan
