linux-kernel - Re: Battery life difference

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Date:	Mon, 07 Jul 2008 11:48:42 +0200
From:	Filippo Zangheri <filippo.zangheri@...oo.it>
To:	Felipe Balbi <felipebalbi@...rs.sourceforge.net>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	linux-acpi@...r.kernel.org
Subject: Re: Battery life difference

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?

Thanks.
Regards.

-- 
Filippo Zangheri

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