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.4.64.0708031730180.26230@twin.jikos.cz>
Date:	Fri, 3 Aug 2007 17:31:52 +0200 (CEST)
From:	Jiri Kosina <jikos@...os.cz>
To:	Adam Kropelin <akropel1@...hester.rr.com>
cc:	Dave Jones <davej@...hat.com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Oliver Neukum <oliver@...kum.org>,
	Rogan Dawes <lists@...es.za.net>, Greg KH <gregkh@...e.de>,
	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, Adam Kropelin wrote:

> Although I have no proof immediately at hand, I suspect at a minimum HID 
> power class devices should be blacklisted from autosuspend. Given the 
> spotty USB implementations on many such devices I'd be surprised if 
> suspend worked reliably. 

I agree here.

> Plus if you're connected to such a device for monitoring purposes you're 
> probably powered by it as well, so you have little to gain from suspend 
> even if it works.

I currently don't have any HID UPS by hand to verify, but I'd be surprised 
if they would advertise remote wakeup capability ... ?

Thanks,

-- 
Jiri Kosina
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