linux-kernel - question for cpu voltage scaling in linux

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Message-ID: <1296119519.4653.3.camel@genix>
Date:	Thu, 27 Jan 2011 01:11:59 -0800
From:	mihn <mihnsk@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: question for cpu voltage scaling in linux

Hi,

Sorry for posting cpufreq, linux-acpi as well.

I want to change voltage and frequency seperately.
With cpu-freq, i can change frequency, but cannot change voltage AFAIK.

Can I do this using cpu-freq?

If possible, how can I set voltage with the fixed value?
If not, is there any way to do that?

FYI, i'm using intel i7-core(nehalem) and ubuntu 10.10.
FYI2, i found out i can do using IA32_PERF_CTL register, but there's no
detail from intel.
FYI3, can i change P-state table so that i can only change voltage in P
states?

Thanks,
mihn

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