From 2630addf6b1e7beb21a5e8ec04562cae2e5d9567 Mon Sep 17 00:00:00 2001
From: Puthikorn Voravootivat <puthik@chromium.org>
Date: Thu, 11 May 2017 16:02:23 -0700
Subject: [PATCH] drm/i915: Restore brightness level in aux backlight driver
Git-commit: 2630addf6b1e7beb21a5e8ec04562cae2e5d9567
Patch-mainline: v4.13-rc1
References: FATE#322643 bsc#1055900

Some panel will default to zero brightness when turning the
panel off and on again. This patch restores last brightness
level back when panel is turning back on.

Signed-off-by: Puthikorn Voravootivat <puthik@chromium.org>
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170511230225.142870-8-puthik@chromium.org
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/i915/intel_dp_aux_backlight.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
+++ b/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
@@ -127,6 +127,7 @@ static void intel_dp_aux_enable_backligh
 	}
 
 	set_aux_backlight_enable(intel_dp, true);
+	intel_dp_aux_set_backlight(connector, connector->panel.backlight.level);
 }
 
 static void intel_dp_aux_disable_backlight(struct intel_connector *connector)