Messages in this thread | | | Subject | Re: 2.6.38-rc2: acpi backlight control missing | From | Thomas Meyer <> | Date | Fri, 28 Jan 2011 22:12:05 +0100 |
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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.
kind regards thomas
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