Revert "drm/i915: Add heuristic to determine better way to adjust brightness"
This reverts commit 560a758d. The DPCD backlight commits regress a Thinkpad X1 Carbon 4th Gen and a BXT-P (in CI). Enabling dynamic backlight boots to a black screen, and enabling DPCD backlight leads to a black screen after suspend/resume. References: http://mid.mail-archive.com/20170706135349.6tu3lz7uehazlnnn@boom References: http://mid.mail-archive.com/20170627132326.f2q3yn4bh5flji4q@boom Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101619Reported-by:David Weinehall <david.weinehall@linux.intel.com> Fixes: 560a758d ("drm/i915: Add heuristic to determine better way to adjust brightness") Cc: Jenny TC <jenny.tc@intel.com> Cc: David Weinehall <david.weinehall@linux.intel.com> Cc: Puthikorn Voravootivat <puthik@chromium.org> Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: intel-gfx@lists.freedesktop.org Reviewed-by:
Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> Acked-by:
Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by:
Jani Nikula <jani.nikula@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/f49a89a05f18e90871c2eeadcdcd783ac7961cdf.1500542254.git.jani.nikula@intel.com
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