Hi Jani et al,
A friend of mine Bertrik Sikken (in the Cc) his backlight control
stopped working for him on his Samsung N150Plus netbook.
I took a quick look, and the raw intel_backlight backlight interface
works under 3.14, but the firmware samsung_laptop backlight interface,
which is what most userspace apps will use by default, stops working
in 3.14 .
I've asked him to bisect this and the bisect points out this
commit as the culprit:
b35684b8fa94e04f55fd38bf672b737741d2f9e2 is the first bad commit
commit b35684b8fa94e04f55fd38bf672b737741d2f9e2
Author: Jani Nikula <jani.nikula@xxxxxxxxx>
Date: Thu Nov 14 12:13:41 2013 +0200
drm/i915: do full backlight setup at enable time
We should now have all the information we need to do a full
initialization of the backlight registers.
v2: Keep QUIRK_NO_PCH_PWM_ENABLE for now (Imre).
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Reviewed-by: Imre Deak <imre.deak@xxxxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Note that this laptop has an acpi_video backlight interface too,
but that has been broken from the start and gets disabled by
samsung-laptop based on dmi matching.
Regards,
Hans
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