linux-kernel - Re: i915 backlight

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Message-ID: <CAPBO7TaPxa_13FBDE5Z=Aoa+ePPfLRH0+oWSQyEmO00xSfGqYg@mail.gmail.com>
Date:	Fri, 2 Aug 2013 08:25:18 +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,

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\""


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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-- 
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Salutacions...Josep
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