http://bugzilla.kernel.org/show_bug.cgi?id=12249





------- Comment #54 from tetrom...@gmail.com  2009-02-08 18:18 -------
(In reply to comment #52)
Thomas: on the ThinkPad SL series, both the _BCL and _BQC methods are
non-standard (see comments in my code and in the discussion of this bug).

As for a video.c only solution, I agree it would be nice, but I am not sure if
it's necessary because in 2.6.28 and higher, there is a good mechanism to
prevent video.c and platform drivers from stepping on each others' toes:
acpi_video_backlight_support() and related functions, implemented in
video_detect.c

You can use it manually with the new kernel parameter acpi_backlight; if
acpi_backlight=vendor, then video.c will refrain from touching the backlight,
leaving platform drivers to do it.

video_detect.c can also automatically blacklist certain platforms for video.c;
Zhang Rui's patch (comment #34) would make it automatically blacklist backlight
functionality in laptops with broken _BQC and _BCM methods.


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