From mboxrd@z Thu Jan  1 00:00:00 1970
From: Aaron Lu <aaron.lu@intel.com>
Subject: Re: BUG REPORT backlight acpi: Brightness shortcuts don't work on
 Fujitsu
Date: Wed, 02 Jul 2014 16:50:48 +0800
Message-ID: <53B3C7E8.1060001@intel.com>
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To: Jeremie Tamburini <jeremie.tamburini@gmail.com>, linux-acpi@vger.kernel.org

On 07/01/2014 09:04 PM, Jeremie Tamburini wrote:
> On 30/06/2014 03:33 AM, Aaron Lu wrote:
>> On 06/27/2014 12:26 AM, Jeremie Tamburini wrote:
>>> will these changes also be made to the previous kernels like 3.13?
>>
>> No chance for v3.13 as it lacks other supporting bits, sorry.
> 
> Sorry to bother you again, a very last question!

Never mind.

> 
> The Ubuntu Kernel Team will try to fix the downstream 3.13 kernel, 
> therefore I've been asked to perform the reverse bisect in order to 
> discover which patch has made the change in the 3.16rc1 kernel.
> 
> But.. in this case the patch should be already known. Please, could you 
> show which patch (or group of patches) has fixed the problem?

I think you will need at least:

commit fbc9fe1b4f222a7c575e3bd8e9defe59c6190a04
Author: Aaron Lu <aaron.lu@intel.com>
Date:   Fri Oct 11 21:27:45 2013 +0800

    ACPI / video: Do not register backlight if win8 and native interface exists

commit 0e9f81d3b7cd0649a3bc437391b6a0650f98f844
Author: Aaron Lu <aaron.lu@intel.com>
Date:   Tue Feb 18 13:54:20 2014 +0800

    ACPI / video: Add systems that should favour native backlight interface

commit 751109aad5834375ca9ed0dcfcd85a00cbf872b5
Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Date:   Thu Jun 5 22:47:35 2014 +0200

    ACPI / video: Change the default for video.use_native_backlight to 1

Maybe others, you will need to figure them out.

Thanks,
Aaron

> 
> If not possible.. don't worry! I will go through the reverse bisect.
> It's just to speed up the whole process or at least get infos good to 
> know in advance.
> 
> 
> Thanks again
> Jeremie
>