From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755843AbZKUTFX (ORCPT ); Sat, 21 Nov 2009 14:05:23 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754119AbZKUTFW (ORCPT ); Sat, 21 Nov 2009 14:05:22 -0500 Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:33846 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754028AbZKUTFV (ORCPT ); Sat, 21 Nov 2009 14:05:21 -0500 Date: Sat, 21 Nov 2009 20:05:20 +0100 From: Pavel Machek To: Andrew Lutomirski Cc: linux-kernel@vger.kernel.org, linux-thinkpad@linux-thinkpad.org Subject: Re: High power consumption after suspend/resume cycle Message-ID: <20091121190520.GB2444@ucw.cz> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi! > I'm running a git kernel that's slightly newer than 2.6.32-rc1. > > First, thanks for all the great work everywhere on laptop power > consumption -- on my Lenovo X200s, it looks like Linux is getting > close to Windows (Windows wins by about 0.7W, except that its power > usage frequently spikes since Windows apparently still doesn't know > how to sit still and do nothing, whereas Linux's seems more stable.). > Windows after a reboot, even running KDE with compositing enabled and > while connected to wifi, at least after some tweaking. > > There's a catch, though: after a suspend/resume cycle, power > consumption goes up by over well over a watt. (On a system that draws > about 7 watts before suspending, that's a big deal.) I've tried > turning off X, suspending with 'echo mem > /sys/power/state' to avoid > any distro scripts running, and manually restoring SATA power saving > settings, but it still happens. I even tried unbinding e1000e and > both USB drivers, unloading the i2400 (wimax) driver, iwlagn, and > iwlcore, and it still happens. This is 100% reproducible, and I'd be > happy to test things. > > This could be a BIOS bug I suppose (although I'm running the latest > BIOS), but Windows 7 does not have this problem at all. > > Any ideas about what to try or what subsystem to blame? Well, on thinkpad x60 power consumption is .3W *lower*. You could try comparing lspci -vvv before and after... but this is deep magic and hard to debug. -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html