Re: Avoid C2/C3 idle state

Dominik Brodowski
2009-11-25T08:05:34Z

On Wed, Nov 25, 2009 at 06:53:14AM +0000, Alex wrote:
> --- Mar 24/11/09, Dominik Brodowski <linux@dominikbrodowski.net> ha scritto:
>
> > Da: Dominik Brodowski <linux@dominikbrodowski.net>
> > Oggetto: Re: Avoid C2/C3 idle state
> > A: "Alex" <ambroxa@yahoo.it>
> > Cc: linux-acpi@vger.kernel.org
> > Data: Martedì 24 novembre 2009, 23:29
> > Hey,
> >
> > you can set the maximum C-state to use using the
> > "processor.max_cstate=<value>" parameter. No need to
> > recompile.
>
> Thanks for your kind reply.
>
> A stupid qustion:
> <value> is a numeric value as 1 , 2 , 3 (i.e. processor.max_cstate=1 )
> or is a string like C1 , C2 , C3 (i.e. processor.max_cstate=C1 ) ?

It's the former. I'd suggest you try max_cstate=2 first, as that might save
power, reduce heat and still not interfere with the serial device.

Best,
Dominik