linux-kernel - Re: [PATCH v2 0/3] Fix Win8 backlight issue

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Date:	Sun, 22 Sep 2013 17:10:59 +0800
From:	Aaron Lu <aaron.lu@...el.com>
To:	Igor Gnatenko <i.gnatenko.brain@...il.com>
CC:	linux-acpi@...r.kernel.org, intel-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	Daniel Vetter <daniel@...ll.ch>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Matthew Garrett <matthew.garrett@...ula.com>,
	Seth Forshee <seth.forshee@...onical.com>,
	Lee Chun-Yi <joeyli.kernel@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	Yves-Alexis Perez <corsac@...ian.org>,
	Felipe Contreras <felipe.contreras@...il.com>,
	Henrique de Moraes Holschuh <ibm-acpi@....eng.br>,
	Jani Nikula <jani.nikula@...ux.intel.com>
Subject: Re: [PATCH v2 0/3] Fix Win8 backlight issue

On 09/18/2013 08:36 PM, Igor Gnatenko wrote:
> On Wed, 2013-09-18 at 20:31 +0800, Aaron Lu wrote:
>> On 09/18/2013 02:30 PM, Igor Gnatenko wrote:
>>> On Wed, 2013-09-18 at 09:03 +0800, Aaron Lu wrote:
>>>> On 09/17/2013 09:34 PM, Igor Gnatenko wrote:
>>>>>
>>>>> Aaron, how about fix indicator on ThinkPads ?
>>>>
>>>> Can you please describe the problem in detail, is it that when you
>>>> adjust brightness level through hotkey, there is no GUI indication?
>>>> Thanks.
>>>>
>>>> -Aaron
>>>
>>> Yes. On my ThinkPad X230 I pressing backlight hotkeys. Actually
>>> brightnes changing, but have no indicator in GUI.
>>
>> Oh, that's still the problem of _BCL not getting executed once for
>> Lenovo thinkpad laptops. I borrowed a Thinkpad X1 this afternoon and can
>> reproduce this, I'll take a look at this issue. The thinkpad-acpi module
>> already has a call to _BCL but somehow that doesn't happen.
>>
>> Since it's national holidays here, I'll check this issue when I got back
>> to work on this Saturday. Thanks for the quick test :-)
> Thanks. No problem ;-)

Here is a quick fix for thinkpad-acpi.c:
https://github.com/aaronlu/linux acpi_video_win8
commit thinkpad-acpi: fix handle locate for video and query of _BCL.

Note that it is a separate issue specifically for thinkpad so I'll
submit that patch in another thread.

Thanks,
Aaron
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