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Message-ID: <Pine.LNX.4.44L0.0902161537080.19732-100000@netrider.rowland.org>
Date: Mon, 16 Feb 2009 15:39:15 -0500 (EST)
From: Alan Stern <stern@...land.harvard.edu>
To: Kyle Moffett <kyle@...fetthome.net>
cc: Arjan van de Ven <arjan@...radead.org>,
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, 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.
Alan Stern
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