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Subject: RE:  Re: em64t speedstep technology not supported in kernel yet?
Date: Fri, 30 Sep 2005 05:20:03 -0700
Message-ID: <88056F38E9E48644A0F562A38C64FB6005DECA92@scsmsx403.amr.corp.intel.com>
Thread-Topic: Re: em64t speedstep technology not supported in kernel yet?
Thread-Index: AcXFKQkW1FUP5pgaRNacj9L4u1jOdAAj2eUg
From: "Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>
To: "Wes Felter" <wesley@felter.org>, <linux-kernel@vger.kernel.org>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1779
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>-----Original Message-----
>From: linux-kernel-owner@vger.kernel.org 
>[mailto:linux-kernel-owner@vger.kernel.org] On Behalf Of Wes Felter
>Sent: Thursday, September 29, 2005 11:58 AM
>To: linux-kernel@vger.kernel.org
>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. 

Which kernels did you try? Also, if you can send the acpidump output 
from pmtools here 
http://www.kernel.org/pub/linux/kernel/people/lenb/acpi/utils/
We can see whether BIOS is indeed supporting speedstep or not.

Thanks,
Venki
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