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Maarten and Ville noticed that we are enabling backlight via DP aux very early in the modeset_init path via the intel_dp_aux_setup_backlight() function, since commite7156c8339("drm/i915: Add Backlight Control using DPCD for eDP connectors (v9)"). Looks like all we need to do during _setup_backlight() is read the current brightness state instead of modifying it. v2: Rewrote commit message. Cc: Ville Syrjala <ville.syrjala@linux.intel.com> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Jani Nikula <jani.nikula@intel.com> Cc: Yetunde Adebisi <yetundex.adebisi@intel.com> Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Acked-by: Jani Nikula <jani.nikula@intel.com> Tested-by: Puthikorn Voravootivat <puthik@chromium.org> Fixes:e7156c8339("drm/i915: Add Backlight Control using DPCD for eDP connectors (v9)") Link: http://patchwork.freedesktop.org/patch/msgid/1497384239-2965-1-git-send-email-dhinakaran.pandiyan@intel.com Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>