From mboxrd@z Thu Jan 1 00:00:00 1970 From: mihn Subject: cpu voltage change question Date: Thu, 27 Jan 2011 01:10:53 -0800 Message-ID: <1296119453.4653.1.camel@genix> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: Received: from mail-yi0-f46.google.com ([209.85.218.46]:51220 "EHLO mail-yi0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753363Ab1A0JKt (ORCPT ); Thu, 27 Jan 2011 04:10:49 -0500 Received: by yib18 with SMTP id 18so488591yib.19 for ; Thu, 27 Jan 2011 01:10:48 -0800 (PST) Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: linux-acpi@vger.kernel.org Hi, 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