From mboxrd@z Thu Jan 1 00:00:00 1970 From: Phillip Susi Subject: Re: cpu voltage change question Date: Thu, 27 Jan 2011 11:12:28 -0500 Message-ID: <4D41996C.1060600@cfl.rr.com> References: <1296119453.4653.1.camel@genix> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Return-path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.121]:34114 "EHLO cdptpa-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752000Ab1A0QMX (ORCPT ); Thu, 27 Jan 2011 11:12:23 -0500 In-Reply-To: <1296119453.4653.1.camel@genix> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: mihn Cc: linux-acpi@vger.kernel.org On 1/27/2011 4:10 AM, mihn wrote: > Hi, > > I want to change voltage and frequency seperately. > With cpu-freq, i can change frequency, but cannot change voltage AFAIK. The voltage is controlled by the platform and should already be set to a level appropriate for that frequency. AFAIK, recent intel cpus have MSRs that configure the voltage for each P-state, but these are set up by the bios and shouldn't need changed.