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

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Date:	Fri, 3 Aug 2007 16:03:36 -0400
From:	Dave Jones <davej@...hat.com>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	linux-usb-devel@...ts.sourceforge.net, Greg KH <gregkh@...e.de>,
	linux-kernel@...r.kernel.org, David Brownell <david-b@...bell.net>,
	Alan Stern <stern@...land.harvard.edu>,
	Rogan Dawes <lists@...es.za.net>
Subject: Re: [linux-usb-devel] [PATCH] USB: Only enable autosuspend by
	default on certain device classes

On Fri, Aug 03, 2007 at 06:08:11PM +0200, Oliver Neukum wrote:
 > Am Freitag 03 August 2007 schrieb Matthew Garrett:
 > > > Which is why I didn't suggest doing that, of course.  The only
 > > > one making that kind of straw man argument seems to be you.
 > > 
 > > But however you phrase it, that's effectively what it is. "Does your 
 > > device work?" just makes users wonder why the damn computer doesn't know 
 > > already. "This option may prevent your device from working. Click here 
 > > to switch it off" results in them wondering why it was switched on in 
 > > the first place. Many of our users aren't technical - they don't care 
 > > about saving 200mW, they just care about their printer working when they 
 > > plug it in.
 > 
 > Devices rarely simply crash. Although Windows doesn't do runtime power
 > management, it certainly will suspend all devices when the system goes
 > into suspension. Buggy devices typically disconnect and reconnect when
 > resumed. This is testable for in software without user intervention.

The printer I mentioned earlier this thread wouldn't work again
until I physically unplugged and replugged the usb cable.
It spewed descriptor read errors every time I tried to talk to it.
Even unloading and reloading the usb modules didn't bring it back
to life.

	Dave

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