linux-kernel - Re: [PATCH] Fix backlight control for Acer TravelMate B113

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Date:	Mon, 30 Jun 2014 10:00:43 +0200
From:	Martin Kepplinger <martink@...teo.de>
To:	Aaron Lu <aaron.lu@...el.com>, rui.zhang@...el.com
CC:	rjw@...ysocki.net, lenb@...nel.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Fix backlight control for Acer TravelMate B113

Am 2014-06-30 03:29, schrieb Aaron Lu:
> On 06/29/2014 04:42 PM, Martin Kepplinger wrote:
>> Am 2014-06-23 22:30, schrieb Martin Kepplinger:
>>> Fix backlight control for Acer TravelMate B113 Laptop by adding
>>> it to the video_dmi_table.
>>>
>>> A workaround before that was to use acpi_osi=Linux or
>>> acpi_backlight=vendor on boot but even then, only the function-
>>> keys worked.
>>>
>>> With this change there is no need for boot parameters and DE's
>>> controls work as well.
>>>
>>> Signed-off-by: Martin Kepplinger <martink@...teo.de>
>>> Tested-by: Martin Kepplinger <martink@...teo.de>
>>> ---
>>>  drivers/acpi/video.c |    8 ++++++++
>>>  1 file changed, 8 insertions(+)
>>>
>>> diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
>>> index f8bc5a7..acb0670 100644
>>> --- a/drivers/acpi/video.c
>>> +++ b/drivers/acpi/video.c
>>> @@ -528,6 +528,14 @@ static struct dmi_system_id video_dmi_table[] __initdata = {
>>>  		},
>>>  	},
>>>  	{
>>> +	 .callback = video_set_use_native_backlight,
>>> +	 .ident = "Acer TravelMate B113",
>>> +	 .matches = {
>>> +		DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
>>> +		DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate B113"),
>>> +		},
>>> +	},
>>> +	{
>>>  	.callback = video_set_use_native_backlight,
>>>  	.ident = "HP ProBook 4340s",
>>>  	.matches = {
>>>
>>
>> are there objections or advice on this? this would be really good to
>> have, even if for 3.17.
> 
> For v3.16, we already have this commit to make use_native_backlight
> equal to 1 by default:
> 
> commit 751109aad5834375ca9ed0dcfcd85a00cbf872b5
> Author: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> Date:   Thu Jun 5 22:47:35 2014 +0200
> 
>     ACPI / video: Change the default for video.use_native_backlight to 1
> 
> 
> Thanks,
> Aaron
> 
thanks! That should do it and would be a better solution. I can't test
it on 3.16 though, as rc3 is still broken for me, see
https://lkml.org/lkml/2014/6/30/66

>>
>> thanks.
>>                                 martin
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