Re: Linux 2.6.30-rc8 [also: VIA Support]

Michael S. Zick
2009-06-05T07:27:50Z

On Fri June 5 2009, Harald Welte wrote:
> On Thu, Jun 04, 2009 at 10:07:37AM -0700, Linus Torvalds wrote:
> >
> >
> > Side note: is it more stable if you disable the VIA speedstep thing
> > (whatever it's called (ok, google tells me it's called "TwinTurbo" and
> > "Advanced PowerSaver")?
> >
> > Features like that easily put a huge stress on power regulators etc, if
> > they result in sudden changes in current draw. Underspecced capacitors
> > etc can cause CPU "brown-outs", which in turn can easily cause total
> > failure.
>
> I agree, that might be an interesting test.
>
> As a side note: The C7-M actually uses the same software interface as Intel CPU
> for doing the power transitions (ACPI Performance States). Only very early C7
> models used the cpufreq/e_powersaver.c driver.
>

What is "very early C7 models" in terms of cpuid results?

If you can get permission to reveal those field details -
we can test for that (this build reports "stepping 0" but
I don't trust the report).

Mike
> So if you want to disable it, make sure you disable X86_ACPI_CPUFREQ.
>