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Date:	Sun, 4 Apr 2010 21:34:06 +0200
From:	Pavel Machek <pavel@....cz>
To:	Philippe Troin <phil@...i.org>
Cc:	Mohamed Ikbel Boulabiar <boulabiar@...il.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	linux-kernel@...r.kernel.org, linux-media@...r.kernel.org
Subject: Re: webcam problem after suspend/hibernate

Hi!

> > If unload/reload of uvcvideo helps, it is most likely problem in that.
> > 
> > If unload/reload of ehci_hcd is needed, it is most likely ehci problem.
> 
> My testing shows that:
> 
>  1. If I remove uvcvideo BEFORE suspend and reinsert it after resume,
>     it works.  However, I cannot always rmmod uvcvideo before suspend
>     as it may be in use.
> 
>  2. As a work around, removing ehci_hcd and reinserting ehci_hcd upon
>     resume works as well.
> 
>  3. Since my distribution's kernels come with ehci_hcd built into the
>     kernel, and I cannot do #2 any more, I also found that unbinding
>     and rebinding the device (with the script I sent earlier on) works
>     as well.
> 
> I think uvcvideo is failing to reinitialize the camera on resume, and
> forcing an uvcvideo "reset" with either of these three methods kicks
> uvcvideo into working again.

Ok, that puts the problem firmly into uvcvideo area.

Try changing its _resume routine to whatever is done on device
unplug... it should be rather easy, and is quite close to "correct"
solution.


									Pavel 

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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