linux-kernel - Re: [RFD] Automatic suspend

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Message-ID: <20090217215717.GA25605@linux.intel.com>
Date:	Tue, 17 Feb 2009 13:57:17 -0800
From:	mark gross <mgross@...ux.intel.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Pavel Machek <pavel@...e.cz>, "Rafael J. Wysocki" <rjw@...k.pl>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Arve Hj?nnev?g <arve@...roid.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	"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, Feb 16, 2009 at 11:13:24PM +0000, Matthew Garrett wrote:
> On Mon, Feb 16, 2009 at 11:58:31PM +0100, Pavel Machek wrote:
> 
> > If no devices are being used, and next wakeup is far enough in the
> > future, just put system to sleep. Long enough == so far away that
> > suspend/wakeup is short compared to that... like 20 seconds on PC.
> 
> This is intrinsically difficult with PCs, since we have such a poorly 
> defined set of wakeup events. We can't wakeup on generic network 
> traffic, just WoL. Many machines won't wake up on keyboard events. 
> Meanwhile, on embedded it's becoming a less interesting problem because 
> idle and suspended are often now equivalent states. Concentrating on 
> runtime PM of as much hardware as possible is arguably more interesting 
> for the majority of use cases.

Putting the wake on key event issue aside, is it possible to have wake
up's on the ms time scale?  I ask because I thought the XO did exactly
this (but left the screen live).  Why does it take 20 sec to get into
or out of S3 on my laptop?

--mgross

> 
> -- 
> Matthew Garrett | mjg59@...f.ucam.org
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