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

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Message-ID: <20070803145321.GB17138@redhat.com>
Date:	Fri, 3 Aug 2007 10:53:21 -0400
From:	Dave Jones <davej@...hat.com>
To:	Jiri Kosina <jikos@...os.cz>
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, Aug 03, 2007 at 04:43:16PM +0200, Jiri Kosina wrote:
 > On Fri, 3 Aug 2007, Matthew Garrett wrote:
 > 
 > > Windows will autosuspend hubs, bluetooth devices, HID devices
 > 
 > Hi Matthew,
 > 
 > are you sure about windows suspending the HID devices in runtime? I have 
 > never seen LEDs of USB keyboard connected to windows host to go off after 
 > some time of not using it.

Not so sure about keyboards, but I've seen the LEDs on USB mice dim or go off
after a few seconds of inactivity under Windows, but under Linux they stay on.

 > We have been playing with runtime autosuspend of HID devices, are 
 > currently postponed the full support, as it turns out that many devices 
 > don't support this feature properly (probably due to not being tested in 
 > Windows).

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

	Dave

-- 
http://www.codemonkey.org.uk
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