linux-kernel - Re: [RFD] Automatic suspend

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Date:	Mon, 16 Feb 2009 12:45:20 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Kyle Moffett <kyle@...fetthome.net>,
	Oliver Neukum <oliver@...kum.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Arve Hjønnevåg <arve@...roid.com>,
	Pavel Machek <pavel@....cz>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	mark gross <mgross@...ux.intel.com>,
	"Woodruff, Richard" <r-woodruff2@...com>,
	Uli Luckas <u.luckas@...d.de>,
	Igor Stoppa <igor.stoppa@...ia.com>,
	Brian Swetland <swetland@...gle.com>,
	Len Brown <lenb@...nel.org>
Subject: Re: [RFD] Automatic suspend

On Mon, 16 Feb 2009 15:39:15 -0500 (EST)
Alan Stern <stern@...land.harvard.edu> wrote:

> On Mon, 16 Feb 2009, Kyle Moffett wrote:
> 
> > Userspace may not have a useful decision-making capability regarding
> > functionality versus power-saving, but the user it's talking to
> > might!
> > 
> > I think it would be very useful to have a mechanism for userspace to
> > find out "Link detection on this NIC costs ~50mW" and "No link has
> > been detected for the last 15 minutes", so that it can compile all
> > that sort of information and prompt the user what devices they would
> > like to disable.  Perhaps an "airline mode" sort of thing?
> 
> Even if drivers don't know how much power their devices consume (and
> generally I wouldn't expect them to), it still makes sense to offer
> userspace the discretionary power to force devices into a low-power
> mode.  USB does this.

"stop using it" isn't this discretionary power ?
(for NICs this is "ifconfig .. down")

-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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