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To: linux-kernel@vger.kernel.org
From: Dominik Kopp <my@kabelfunk.de>
Subject: Re: [BISECTED] (?) since 3.16: USB video cam of an HP Pavilion dv7 laptop not working
Date: Wed, 01 Oct 2014 22:51:15 +0200
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Jörg-Volker Peetz wrote:

> Since 3.16 the builtin USB video cam of an HP Pavilion dv7 laptop shows
> only a black screen with the application guvcview although the video LED
> is turned on. There is no hint in dmesg. Also the output of guvcview shows
> no conspicuousness.
> 
> With kernel version 3.15.9 the camera works.
> 
> I tried to bisect between good v3.15 and bad v3.16, which identified
> 
> commit 9262c19d14c433a6a1ba25c3ff897cb89e412309
...
> 
> Thanks for any help,
> Jörg-Volker.

please have a look at
https://bugzilla.kernel.org/show_bug.cgi?id=81611

Due to a change in the driver, guvcview won't work with kernel 3.16.
You have to revert up to two kernel commits or use the latest version of 
guvcview (git version >2.0.0)

regards
Dominik Kopp