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    Subject[PATCH v2 0/3] Fix Win8 backlight issue
    Date
    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.

    Apply on top of v3.12-rc1.

    Aaron Lu (3):
    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

    drivers/acpi/internal.h | 5 +-
    drivers/acpi/video.c | 442 ++++++++++++++++++++----------------
    drivers/acpi/video_detect.c | 14 +-
    drivers/video/backlight/backlight.c | 31 +++
    include/acpi/video.h | 2 +
    include/linux/backlight.h | 4 +
    6 files changed, 300 insertions(+), 198 deletions(-)

    --
    1.8.4.12.g2ea3df6



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