linux-kernel - Re: [RFD] Automatic suspend

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Message-ID: <20090217135833.GB25029@sirena.org.uk>
Date:	Tue, 17 Feb 2009 13:58:34 +0000
From:	Mark Brown <broonie@...ena.org.uk>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Arjan van de Ven <arjan@...radead.org>,
	"Woodruff, Richard" <r-woodruff2@...com>,
	Alan Stern <stern@...land.harvard.edu>,
	Kyle Moffett <kyle@...fetthome.net>,
	Oliver Neukum <oliver@...kum.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Arve Hj?nnev?g <arve@...roid.com>, Pavel Machek <pavel@....cz>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	mark gross <mgross@...ux.intel.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, Feb 16, 2009 at 11:23:30PM +0000, Matthew Garrett wrote:

> Arve said that the power state was equivalent in idle and suspend, but 
> that they preferred suspend because it stopped any periodic timers. I'd 
> be more interested in making sure that unnecessary timers aren't running 
> than focusing on automatically entering system-wide suspend - Nokia have 
> been managing this since 2005 with good results.

Definitely.  Even in the embedded case there is hardware which takes a
relatively long time to fully power down and resume without winning an
enormous amount on the power front (analogue stuff is a common culprit
here, it can take a noticable amount of time to bring it up cleanly).
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