From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dan Carpenter <dan.carpenter@oracle.com>
Subject: Re: Backlight control broken between 3.6.0-rc1 and 3.6.0-rc4
Date: Tue, 25 Sep 2012 14:40:36 +0300
Message-ID: <20120925114036.GE5368@mwanda>
References: <CAN0CFw1GiAZxLcRGaEOxYcGhOfF2hjDuoF+e0T8r_ZryTFzw5Q@mail.gmail.com>
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To: Grant <emailgrant@gmail.com>
Cc: linux-kernel@vger.kernel.org, Matthew Garrett <mjg59@srcf.ucam.org>, platform-driver-x86@vger.kernel.org

On Sun, Sep 16, 2012 at 04:25:10AM -0700, Grant wrote:
> I have a Dell XPS 13 Ultrabook laptop.  Backlight control used to be
> broken, it works in 3.6.0-rc1, and it is broken again in 3.6.0-rc4.
> 

I've filed a bug for this.
https://bugzilla.kernel.org/show_bug.cgi?id=47941

Please add the following information:
*) Complete dmesg
*) lsmod, working and non-working
*) .config

regards,
dan carpenter