From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754898AbYCMRuK (ORCPT ); Thu, 13 Mar 2008 13:50:10 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752514AbYCMRt6 (ORCPT ); Thu, 13 Mar 2008 13:49:58 -0400 Received: from gateway.drzeus.cx ([85.8.24.16]:36611 "EHLO smtp.drzeus.cx" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752469AbYCMRt5 (ORCPT ); Thu, 13 Mar 2008 13:49:57 -0400 Date: Thu, 13 Mar 2008 18:49:38 +0100 From: Pierre Ossman To: Len Brown Cc: linux-pm@lists.linux-foundation.org, Pavel Machek , LKML , Adam Belay , Andi Kleen , Lee Revell Subject: Re: [linux-pm] [PATCH] cpuidle: avoid singing capacitors Message-ID: <20080313184938.7e27acf8@mjolnir.drzeus.cx> In-Reply-To: <20080313173437.5f00f70e@mjolnir.drzeus.cx> References: <20080310100008.GA9520@elf.ucw.cz> <20080310134915.45ae7446@mjolnir.drzeus.cx> <200803121511.17389.lenb@kernel.org> <20080313173437.5f00f70e@mjolnir.drzeus.cx> X-Mailer: Claws Mail 3.3.1 (GTK+ 2.12.8; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 13 Mar 2008 17:34:37 +0100 Pierre Ossman wrote: > > It does not. But my C3 desc looks like this: > > state3/desc:ACPI FFH INTEL MWAIT 0x50 > > What's the meaning of the last number? > I've surfed Intel's web site for a bit, and found the MWAIT instruction in the arch docs. Unfortunately, it does not explain the value 0x50. According to the docs, that would be C6, which is not listed in the regular set of states for the Core 2. I did find this however: http://www.trustedreviews.com/cpu-memory/review/2007/03/30/Intel-Processor-Roadmap-Penryn-Nehalem-and-the-Future/p2 It says that C6 is some ultra low power mode where more or less the entire chip is powered down. Len, Venkatesh, do you have some insight? And is it harmless to move to more power hungry modes (i.e. C4 or C3). Rgds -- -- Pierre Ossman Linux kernel, MMC maintainer http://www.kernel.org PulseAudio, core developer http://pulseaudio.org rdesktop, core developer http://www.rdesktop.org