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    SubjectRe: [PATCH v2 0/3] Fix Win8 backlight issue
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    On Tue, 2013-09-17 at 17:23 +0800, Aaron Lu wrote:
    > 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(-)
    >

    Aaron, how about fix indicator on ThinkPads ?

    --
    Igor Gnatenko
    Fedora release 20 (Heisenbug)
    Linux 3.11.1-300.fc20.x86_64



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