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    From
    SubjectRe: 2.6.38-rc2: acpi backlight control missing
    Date
    Am 31.01.2011 um 21:39 schrieb "Rafael J. Wysocki" <rjw@sisk.pl>:

    > On Friday, January 28, 2011, Thomas Meyer wrote:
    >> Am Samstag, den 22.01.2011, 20:43 +0100 schrieb Rafael J. Wysocki:
    >>> On Saturday, January 22, 2011, Thomas Meyer wrote:
    >>>> with 2.6.38-rc2 the acpi backlight is gone:
    >>>>
    >>>> any ideas?
    >>>
    >>> Not really, but Matthew may have some (CCed).
    >>
    >> Okay, found the problem.
    >>
    >> This commit broke my backlight:
    >>
    >> commit 677bd810eedce61edf15452491781ff046b92edc
    >> Author: Zhang Rui <rui.zhang@intel.com>
    >> Date: Mon Dec 6 15:04:21 2010 +0800
    >>
    >> ACPI video: remove output switching control
    >>
    >> This is because in function
    >> "acpi_is_video_device()" (drivers/acpi/video_detect.c) the backlight
    >> device is only checked when some video capabilities were found, but by
    >> removing the check for the VIDEO_OUTPUT_SWITCHING (that seems to be the
    >> only video capability on my system) the check for the backlight device
    >> isn't done anymore.
    >>
    >> by reverting above commit, the backlight is back again.
    >
    > Is it the same issue as https://bugzilla.kernel.org/show_bug.cgi?id=27702 ?

    Yes, it is.

    > In case it is, can you test the patch in there, please?
    >

    Didn't test the patch. But it should do the trick.

    > Rafael


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