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Message-ID: <20080826094426.GB30062@elf.ucw.cz> Date: Tue, 26 Aug 2008 11:44:26 +0200 From: Pavel Machek <pavel@...e.cz> To: linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org Subject: Re: autosuspend for SCSI devices 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@...land.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 -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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