[PATCH v3 0/4] Fix Win8 backlight issue

[Jörg Otte]

Backlight can't be modified with this patch set -  neither with function
keys nor
with the gui. It is a step backward to v3.11-rc1

Video driver: i915
FUJITSU LIFEBOOK AH532/FJNBB1C, BIOS Version 1.09 05/22/2012

acpi_backlight=video works.

Jörg


2013/9/24 Igor Gnatenko <i.gnatenko.brain at gmail.com>

> On Tue, 2013-09-24 at 17:47 +0800, Aaron Lu wrote:
> > v3:
> > 1 Add a new patch 4/4 to fix some problems in thinkpad-acpi module;
> > 2 Remove unnecessary function acpi_video_unregister introduced in
> >   patch 2/3 as pointed out by Jani Nikula.
> >
> > v2:
> > v1 has the subject of "Rework ACPI video driver" and is posted here:
> > http://lkml.org/lkml/2013/9/9/74
> > Since the objective is really to fix Win8 backlight issues, I changed
> > the subject in this version, sorry about that.
> >
> > This patchset has three patches, the first introduced a new API named
> > backlight_device_registered in backlight layer that can be used for
> > backlight interface provider module to check if a specific type backlight
> > interface has been registered, see changelog for patch 1/3 for details.
> > Then patch 2/3 does the cleanup to sepeate the backlight control and
> > event delivery functionality in the ACPI video module and patch 3/3
> > solves some Win8 backlight control problems by avoiding register ACPI
> > video's backlight interface if:
> > 1 Kernel cmdline option acpi_backlight=video is not given;
> > 2 This is a Win8 system;
> > 3 Native backlight control interface exists.
> >
> > Technically, patch 2/3 is not required to fix the issue here. So if you
> > think it is not necessary, I can remove it from the series.
> >
> > Aaron Lu (4):
> >   backlight: introduce backlight_device_registered
> >   ACPI / video: seperate backlight control and event interface
> >   ACPI / video: Do not register backlight if win8 and native interface
> >     exists
> >   thinkpad-acpi: fix handle locate for video and query of _BCL
> >
> >  drivers/acpi/internal.h              |   5 +-
> >  drivers/acpi/video.c                 | 442
> ++++++++++++++++++++---------------
> >  drivers/acpi/video_detect.c          |  14 +-
> >  drivers/platform/x86/thinkpad_acpi.c |  31 ++-
> >  drivers/video/backlight/backlight.c  |  31 +++
> >  include/acpi/video.h                 |   2 +
> >  include/linux/backlight.h            |   4 +
> >  7 files changed, 324 insertions(+), 205 deletions(-)
> >
>
> Excellent! I've tested this patch-set on ThinkPad X230 and backlight
> issue is exhausted.
>
> Thanks.
>
> --
> Igor Gnatenko
> Fedora release 20 (Heisenbug)
> Linux 3.11.1-300.fc20.x86_64
>
>
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