Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754285Ab2EFRkH (ORCPT ); Sun, 6 May 2012 13:40:07 -0400 Received: from plane.gmane.org ([80.91.229.3]:32843 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754196Ab2EFRkG (ORCPT ); Sun, 6 May 2012 13:40:06 -0400 X-Injected-Via-Gmane: http://gmane.org/ To: linux-kernel@vger.kernel.org From: Uwe Bonnes Subject: Re: [PATCH] drivers:gpu:vga_switcheroo: Work around dramatic power drain in laptops Date: Sun, 6 May 2012 17:36:43 +0000 (UTC) Message-ID: References: <1335645928-30993-1-git-send-email-alexander.tarasikov@gmail.com> <1335645928-30993-2-git-send-email-alexander.tarasikov@gmail.com> <20120428221003.49fb248d@pyramind.ukuu.org.uk> X-Complaints-To: usenet@dough.gmane.org X-Gmane-NNTP-Posting-Host: elektron.ikp.physik.tu-darmstadt.de User-Agent: tin/1.8.2-20060425 ("Shillay") (UNIX) (Linux/2.6.13-15.18-default (i686)) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2317 Lines: 49 Alexander Tarasikov wrote: > 2012/4/29 Alan Cox : > > The module parameter is probably the wrong long term option. Do you know > > if the problem is general or specific to some laptops. If it's the latter > > then it might also be worth implementing a DMI and/or PCI detection > > routine to match the laptops you know are afflicted and automatically > > enabled it. > > Alan > I agree that module parameter is not a good idea, but I have seen a > lot of reports of the problem and no patches were proposed, > so I tried to do what I could. It > could be a good temporary solution until we make sure it does not break > any configurations. I am unsure how muxless/muxed cards may differ in > behaviour. > I suspect that the problem is specific to all laptops with > intel+radeon combination. Intel+Nvidia combination seems to be affected too! > So far I have found these reports of radeon eating battery > [2010] Acer TravelMate Timeline 8371 > [2012] Hp Envy 14 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/909337 > [2012] Thinkpad T400 https://bbs.archlinux.org/viewtopic.php?id=133329 > [2012] Sony Vaio SE15 (VPCSE1v9E) > http://blog.ejbca.org/2012/02/ubuntu-gnulinux-1204-precise-on-sony.html I can confirm the problem with an intel+nvidia combination, on a Thinkpad T520: > lspci |grep -i VGA 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core \ Processor Family Integrated Graphics Controller (rev 09) 01:00.0 VGA compatible controller: nVidia Corporation GF119 [Quadro NVS 4200M] (rev ff) I suspend with "DIS"cret graphics off. Resuming comes up with about 5 Watt more power drain compared before suspend. Switching "DIS" needs another 5 Watt. Switching "DIS" off again brings me back to the power drain level before suspend. I vote for Alexander proposal! Bye -- Uwe Bonnes bon@elektron.ikp.physik.tu-darmstadt.de Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt --------- Tel. 06151 162516 -------- Fax. 06151 164321 ---------- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/