From: Tino Keitel <tino.keitel@gmx.de>
To: Kernel development list <linux-kernel@vger.kernel.org>
Subject: Re: Battery life difference
Date: Mon, 7 Jul 2008 23:37:25 +0200 [thread overview]
Message-ID: <20080707213725.GA28879@dose.home.local> (raw)
In-Reply-To: <4871E67A.1040600@yahoo.it>
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 <arjan@infradead.org> 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
prev parent reply other threads:[~2008-07-07 21:58 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-05 13:17 Felipe Balbi
2008-07-05 13:36 ` Theodore Tso
2008-07-05 14:00 ` Felipe Balbi
2008-07-09 20:29 ` Pavel Machek
2008-07-10 5:16 ` Tino Keitel
2008-07-05 15:23 ` Arjan van de Ven
2008-07-05 15:44 ` Felipe Balbi
2008-07-05 15:54 ` Arjan van de Ven
2008-07-05 17:41 ` Felipe Balbi
2008-07-05 19:34 ` Arjan van de Ven
2008-07-05 19:44 ` Felipe Balbi
2008-07-09 20:32 ` Pavel Machek
2008-07-06 17:21 ` Tino Keitel
2008-07-07 9:48 ` Filippo Zangheri
2008-07-07 21:37 ` Tino Keitel [this message]
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