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.nik...@intel.com> 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.nik...@intel.com> Reviewed-by: Imre Deak <imre.d...@intel.com> Signed-off-by: Daniel Vetter <daniel.vet...@ffwll.ch> 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 _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx