linux-kernel - Re: Battery life difference

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Date:	Mon, 7 Jul 2008 23:37:25 +0200
From:	Tino Keitel <tino.keitel@....de>
To:	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: Battery life difference

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@...radead.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
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