linux-kernel - Re: [linux-usb-devel] [PATCH] USB: Only enable autosuspend by default on certain device classes

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Message-ID: <Pine.LNX.4.64.0708031655180.26230@twin.jikos.cz>
Date:	Fri, 3 Aug 2007 16:58:09 +0200 (CEST)
From:	Jiri Kosina <jikos@...os.cz>
To:	Dave Jones <davej@...hat.com>
cc:	Matthew Garrett <mjg59@...f.ucam.org>, Greg KH <gregkh@...e.de>,
	Rogan Dawes <lists@...es.za.net>,
	Oliver Neukum <oliver@...kum.org>,
	linux-kernel@...r.kernel.org, David Brownell <david-b@...bell.net>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-usb-devel@...ts.sourceforge.net
Subject: Re: [linux-usb-devel] [PATCH] USB: Only enable autosuspend by default
 on certain device classes

On Fri, 3 Aug 2007, Dave Jones wrote:

> Interesting.  Which devices did you notice failing? Was it a case that 
> they would sleep and not come back out of that state?

Random keyboards, even connection to EHCI/OHCI seemed to make difference. 
We have been doing some experiments with Alan during OLS and it seemed 
quite hopeless.

A few keyboards we have been testing with seemed to be losing keypressess 
when coming out of suspend (if and only if the root hub wasn't suspended 
too, etc. Magic).

-- 
Jiri Kosina
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