Re: [2.5. PATCH] cpufreq: correct initialization on Intel Copperm ines

From: Dominik Brodowski (
Date: Sun Nov 10 2002 - 04:27:34 EST


On Sat, Nov 09, 2002 at 04:54:27PM -0800, Perez-Gonzalez, Inaky wrote:
> > [2.5. PATCH] cpufreq: Intel Coppermines -- the saga continues.
> >
> > The detection process for speedstep-enabled Pentium III Coppermines is
> > considered proprietary by Intel. The attempt to detect this
> > capability using MSRs failed. So, users need to pass the option
> > "speedstep_coppermine=1" to the kernel (boot option or parameter) if
> > they own a SpeedStep capable PIII Coppermine processor. Tualatins work
> > as before.
> Cannot you use ACPI to detect that? AFAIK, if the machine supports it, it is
> doable.

Most PIII Coppermine notebooks only have ACPI 1.x which does not include
"Performance States" - an interface to Intel SpeedStep and other, similar
technologies. And when there is a working "Performance States" support in
ACPI, this itself registered as cpufreq driver and then there's no need for
the legacy speedstep driver. So, no, unfortunately your suggestion doesn't
solve the problem.

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This archive was generated by hypermail 2b29 : Fri Nov 15 2002 - 22:00:19 EST