linux-kernel - Re: Async resume patch (was: Re: [GIT PULL] PM updates for 2.6.33)

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Message-ID: <Pine.LNX.4.44L0.0912091204550.4120-100000@iolanthe.rowland.org>
Date:	Wed, 9 Dec 2009 12:10:03 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Zhang Rui <rui.zhang@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>
Subject: Re: Async resume patch (was: Re: [GIT PULL] PM updates for 2.6.33)

On Wed, 9 Dec 2009, Mark Brown wrote:

> > How long does it take to bring down the entire embedded audio 
> > subsystem?  And how critical is the timing for typical systems?
> 
> Worst case is about a second for both resume and suspend which means two
> seconds total but it's very hardware dependant.  

A second seems awfully long.  What happens if audio isn't being played
when the suspend occurs?  Can't you shorten things with no artifacts in
that case?

If audio _is_ being played when a suspend occurs, users probably don't 
mind audible artifacts.  In fact, they probably expect some.

Alan Stern

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