From mboxrd@z Thu Jan  1 00:00:00 1970
From: Felipe Contreras <felipe.contreras@gmail.com>
Subject: Re: [Update][PATCH 0/3] Fix backlight issues on some
	Windows 8 systems
Date: Mon, 29 Jul 2013 13:01:02 -0500
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To: Jani Nikula <jani.nikula@linux.intel.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>, daniel.vetter@ffwll.ch, intel-gfx@lists.freedesktop.org
List-Id: intel-gfx@lists.freedesktop.org

Hi,

On Fri, Jul 26, 2013 at 8:24 AM, Jani Nikula
<jani.nikula@linux.intel.com> wrote:
> On Sat, 20 Jul 2013, Felipe Contreras <felipe.contreras@gmail.com> wrote:
>> I tried this patch series and it's as I expected, it's the same as
>> acpi_backlight=vendor, and the intel backlight driver doesn't work
>> correctly in this machine. If you are actually serious about the
>> mantra of "no user-space regressions", then for this machine at least,
>> you need to use the ACPI backlight with Windows8 OSI disabled, until
>> the intel backlight driver is fixed. My patch does that:
>>
>> http://article.gmane.org/gmane.linux.acpi.devel/60969
>
> Hi Felipe, would you mind trying the following patch on top of -rc2,
> without your quirk patch? Up front, I'm not sure what all your failure
> modes are, I'm not claiming this fixes them, and frankly, it didn't do
> anything on a machine I tried... I just have this hunch it might help
> with the ACPI hotkeys on some BIOSes. Maybe you're the lucky one! :)

I did try this patch and I still see the same issue: when I go to the
lowest level (xbacklight -set 0), the backlight is completely off. It
seems in -rc2 the intel backlight driver works better, and can be
controlled from the keys just fine, but it's still not as good as the
acpi one minus win8.

I don't notice any difference with your patch.

Cheers.

-- 
Felipe Contreras