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    Subject[PATCH 7/8] ACPI video: Still use ACPI backlight control if _DOS doesn't exist
    Date
    From: Zhang Rui <rui.zhang@intel.com>

    This fixes a regression in 3.4-rc1 caused by commit
    ea9f8856bd6d4ed45885b06a338f7362cd6c60e5
    (ACPI video: Harden video bus adding.)

    Some platforms don't have _DOS control method, but the ACPI
    backlight still works.
    We should not invoke _DOS for these platforms.

    https://bugzilla.kernel.org/show_bug.cgi?id=43168

    Cc: Igor Murzov <intergalactic.anonymous@gmail.com>
    Cc: stable@vger.kernel.org
    Signed-off-by: Zhang Rui <rui.zhang@intel.com>
    Signed-off-by: Len Brown <len.brown@intel.com>
    ---
    drivers/acpi/video.c | 2 ++
    1 file changed, 2 insertions(+)

    diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
    index 9577b6f..4134b30 100644
    --- a/drivers/acpi/video.c
    +++ b/drivers/acpi/video.c
    @@ -558,6 +558,8 @@ acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
    union acpi_object arg0 = { ACPI_TYPE_INTEGER };
    struct acpi_object_list args = { 1, &arg0 };

    + if (!video->cap._DOS)
    + return 0;

    if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
    return -EINVAL;
    --
    1.7.11.1.104.ge7b44f1


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