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This is commit0f540c3a7cupstream. Since commitee1452d745Author: Jani Nikula <jani.nikula@intel.com> Date: Fri Sep 20 15:05:30 2013 +0300 drm/i915: assume all GM45 Acer laptops use inverted backlight PWM failed and was later reverted in commitbe505f6439Author: Alexander van Heukelum <heukelum@fastmail.fm> Date: Sat Dec 28 21:00:39 2013 +0100 Revert "drm/i915: assume all GM45 Acer laptops use inverted backlight PWM" fix the individual broken machine instead. Note to backporters: http://patchwork.freedesktop.org/patch/17837/ is the patch you want for 3.13 and older. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=54171 Reference: http://mid.gmane.org/DUB115-W7628C7C710EA51AA110CD4A5000@phx.gbl Signed-off-by: Jani Nikula <jani.nikula@intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> [danvet: Patch mangling for 3.14 plus adding the link to the original for 3.13.] Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>