linux-kernel - cpu voltage scaling

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Message-ID: <AANLkTikfKduOsPPtxm0uO5qDUxZG1iZN-hnpqUdvPkZJ@mail.gmail.com>
Date:	Thu, 10 Feb 2011 00:07:10 -0800
From:	mihn leigh <mihnsk@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: cpu voltage scaling

Hi,

I want to change voltage and frequency seperately in intel i7 core(nehalem).
With cpu-freq, i can change frequency, but cannot change voltage AFAIK.

I tried PHC "http://www.linux-phc.org", but change of voltage leads to
frequency as well.
Also, i tried to change IA32_PERF_CTL(MSR) register, but i also failed
to fix the frequency while changing the voltage.

Now, i have a plan to dig into PPC table, but i'm not sure if it's
possible or not.
Could you guys give me some infomartion how to change voltage seperately?

Thanks,
mihn
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