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SubjectRe: [PATCH v3 0/4] Fix Win8 backlight issue
On Tue, Sep 24, 2013 at 05:47:28PM +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(-)

Just tested this series on my HP revolve 810 and this fixes the backlight
issue it had :)

Feel free to add my,

Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>


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