linux-kernel - Re: i915 backlight

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Message-ID: <CAPBO7TZ2nHoF_oZCgSfy0Vs=phqpLT3tWC35kSi9tUQWe3vc9A@mail.gmail.com>
Date:	Fri, 2 Aug 2013 09:25:09 +0200
From:	Josep Lladonosa <jlladono@...il.com>
To:	Aaron Lu <aaron.lu@...el.com>
Cc:	Borislav Petkov <bp@...en8.de>, "Rafael J. Wysocki" <rjw@...k.pl>,
	intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
	lkml <linux-kernel@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: i915 backlight

Hello,

Yes, it works! I get now 11 levels from all black to the brightest.

acpi_listen shows messages

Josep

On 2 August 2013 08:36, Aaron Lu <aaron.lu@...el.com> wrote:
> On 08/02/2013 02:25 PM, Josep Lladonosa wrote:
>> Hello,
>>
>> I am using a Lenovo Edge E530 and, with kernel 3.11.0-rc3, I had to
>> change to this parameter to the kernel boot:
>>
>>
>> GRUB_CMDLINE_LINUX="acpi_osi=\"!Windows 2012\""
>
> What if you remove the above from kernel command line, and add
> video.brightness_switch_enabled=0 to kernel command line, then set the
> following in xorg.conf:
> $ cat /etc/X11/xorg.conf
> Section "Device"
>         Option     "Backlight"  "intel_backlight"
>         Identifier  "Card0"
>         Driver      "intel"
>         BusID       "PCI:0:2:0"
> EndSection
>
> Does everything work?
>
> If not, please test if manually change brightness level through sysfs
> works:
> # cd /sys/calss/backlight/intel_backlight
> # echo xxx > brightness
>
> And also test if hotkey event is sent out or not by running acpi_listen
> and then press the hotkey.
>
> Thanks,
> Aaron
>
>>
>>
>> instead of previous
>>
>> GRUB_CMDLINE_LINUX="acpi_osi=Linux acpi_backlight=vendor"
>>
>> to be able to change brightness. In some kernel versions before, it
>> worked, but with 15 levels, but in graphical system brightness bar was
>> not moving.
>>
>>
>> Now I have, though, 8 possible values for brightness and brightness
>> bar shows its correct position.
>>
>> Josep
>>
>> On 2 August 2013 08:00, Aaron Lu <aaron.lu@...el.com> wrote:
>>> On 08/01/2013 04:07 PM, Borislav Petkov wrote:
>>>> On Wed, Jul 31, 2013 at 11:16:52PM +0200, Rafael J. Wysocki wrote:
>>>>> Does reverting efaa14c help?
>>>>
>>>> Nope.
>>>>
>>>> But see my other reply to Aaron.
>>>
>>> Assume you have specified to use intel_backlight in xorg.conf, does
>>> booting with video.brightness_switch_enabled=0 help?
>>>
>>> Thanks,
>>> Aaron
>>> --
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>>
>>
>>
>



-- 
--
Salutacions...Josep
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