Date: Tue, 26 Aug 2008 11:44:26 +0200
From: Pavel Machek <pavel@suse.cz>
To: linux-kernel@vger.kernel.org, linux-pm@lists.linux-foundation.org
Subject: Re: autosuspend for SCSI devices
Message-ID: <20080826094426.GB30062@elf.ucw.cz>
References: <20080822105626.GA9475@elf.ucw.cz> <20080825194702.GA31007@dose.home.local>
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On Mon 2008-08-25 21:47:03, Tino Keitel wrote:
> On Fri, Aug 22, 2008 at 12:56:27 +0200, Pavel Machek wrote:
> > From: Alan Stern <stern@rowland.harvard.edu>
> > 
> > Add support for autosuspend/autoresume of the SCSI devices. Lowlevel
> > driver can use it to spin the disk down... and it is neccessary step
> > for powering down the controllers.
> > 
> > Spinning down the disk is useful - saves ~0.5W here, and it is last
> > major thing we can do to save power on some small machines like
> > Kohjinsha subnotebooks.
> 
> Is there a difference regarding power saving to the already existing
> ways to spin down a disk, like noflushd? In a previous patch you
> mentioned that this can be used to disable the SATA port so save even
> more power. However, this part seems to be missing in this patch,
> right?

Correct. That is the plan for the next patch, when I get this one into
reasonable form for acceptance.
								Pavel

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