On Fri, Sep 30, 2005 at 05:20:03AM -0700, Pallipadi, Venkatesh wrote:
>
> >-----Original Message-----
> >From: [email protected]
> >[mailto:[email protected]] On Behalf Of Wes Felter
> >Sent: Thursday, September 29, 2005 11:58 AM
> >To: [email protected]
> >Subject: Re: em64t speedstep technology not supported in kernel yet?
> >
> >Richard Wohlstadter wrote:
> >> Hello all,
> >>
> >> We recently had Intel give our company a roadmap
> >presentation where they
> >> told us that their enhanced speedstep technology was
> >supported by linux
> >> kernels 2.6.9+. I have since tried to get cpufreq speedstep
> >driver to
> >> work with no luck on our em64t Xeon 3.6g processors. Intel
> >even has a
> >> webpage describing the technology and how to get it working at url:
> >> http://www.intel.com/cd/ids/developer/asmo-na/eng/195910.htm?prn=Y
> >
> >I think this is a BIOS problem; the BIOS needs to provide the proper
> >ACPI frequency/voltage tables for cpufreq to use. You might want to
> >harass your system/motherboard vendor.
> >
> >Alternately maybe you can find someone who can give you the
> >secret table and then you can just hardcode it into the driver.
>
> Yes. Make sure speedstep is supported and enabled in BIOS. Typically,
> there will be a BIOS config option under CPU section, called Speedstep,
> Enhanced Speedstep or EIST or something like that.
The BIOS tables make no difference at all however to the speedstep-centrino
module (which in retrospect really should have been speedstep-est or something)
as it has no OP() tables or cpu recognition for Xeons.
Dave
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