Re: [PATCH 1/1] cpufreq: eeepc 900 frequency scaling driver

Len Brown
2009-03-16T04:24:34Z

On Tue, 2 Dec 2008, Pavel Machek wrote:

> On Tue 2008-12-02 16:15:21, Matthew Garrett wrote:
> > On Sun, Nov 23, 2008 at 07:04:09PM +0100, Pavel Machek wrote:
> >
> > > Is this really needed? Could we simply talk to the cpu directly,
> > > without help of ACPI?
> >
> > No. The ACPI write ends up talking to the embedded controller and some
> > io ports.
>
> Oops... I always knew that eee-s are broken by design (reporting
> battery percent as mWh, etc...) but I did not realize how bad it
> is. (ACPI has perfectly standard cpu frequency scaling interface, even
> if it is not used too often these days....)

Huh?

What cpufreq driver is deployed more broadly than acpi-cpufreq?
AFAIK, Linux uses it on nearly every ACPI compliant Intel-based
system that has frequency scaling.

-Len