Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758894AbYGGV62 (ORCPT ); Mon, 7 Jul 2008 17:58:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758694AbYGGV5v (ORCPT ); Mon, 7 Jul 2008 17:57:51 -0400 Received: from eazy.amigager.de ([213.239.192.238]:50058 "EHLO eazy.amigager.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758676AbYGGV5v (ORCPT ); Mon, 7 Jul 2008 17:57:51 -0400 X-Greylist: delayed 1279 seconds by postgrey-1.27 at vger.kernel.org; Mon, 07 Jul 2008 17:57:50 EDT Date: Mon, 7 Jul 2008 23:37:25 +0200 From: Tino Keitel To: Kernel development list Subject: Re: Battery life difference Message-ID: <20080707213725.GA28879@dose.home.local> Mail-Followup-To: Kernel development list References: <31e679430807050617u3fc706fasee9bb43a151c501f@mail.gmail.com> <20080705082352.4b6be669@infradead.org> <31e679430807050844r30ff74fby7e15641573b42d82@mail.gmail.com> <20080706172159.GA12736@x61> <4871E67A.1040600@yahoo.it> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4871E67A.1040600@yahoo.it> 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 Content-Length: 1263 Lines: 33 On Mon, Jul 07, 2008 at 11:48:42 +0200, Filippo Zangheri wrote: > On 06/07/2008 19:21, Tino Keitel wrote: > > On Sat, Jul 05, 2008 at 18:44:21 +0300, Felipe Balbi wrote: > >> Hi, > >> > >> On Sat, Jul 5, 2008 at 6:23 PM, Arjan van de Ven wrote: > > > > [...] > > > >>> Also take a look at > >>> http://kerneltrap.org/mailarchive/linux-kernel/2008/5/8/1771024 because > >>> these patches save like 0.75W in our lab. > >> cool, is it merged upstream ? > > > > If I got this right, at least Linux 2.6.25 allows to control this via > > "/sys/class/scsi_host/host*/link_power_management_policy". Setting it > > to "min_power" does the trick. This is also covered by powertop 1.10 > > and later. > > I cannot see this on 2.6.25.9. Is there a particular configuration option > you must enable, or it just didn't make it to 2.6.25? All I can say is that I see it with 2.6.25.9 on a Thinkpad X61s with SATA set to AHCI. See commit ca77329fb713b7fea6a307068e0dd0248e7aa640 for details. Regards, Tino -- 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/