diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 0b2e842..b80162e 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1150,8 +1150,18 @@ static void ironlake_panel_vdd_work(struct work_struct *__work)
 						 struct intel_dp, panel_vdd_work);
 	struct drm_device *dev = intel_dp_to_dev(intel_dp);
 
+	DRM_DEBUG_KMS("XXX: dev=%p intel_dp=%p\n", dev, intel_dp);
+
+    if (mutex_is_locked(&dev->mode_config.mutex)) {
+        DRM_DEBUG_KMS("XXX: mutex_is_locked, trying to unlock\n");
+        mutex_unlock(&dev->mode_config.mutex);
+    }
+
+	DRM_DEBUG_KMS("XXX: before lock mode_config\n");
 	mutex_lock(&dev->mode_config.mutex);
+	DRM_DEBUG_KMS("XXX: inside lock mode_config\n");
 	ironlake_panel_vdd_off_sync(intel_dp);
+	DRM_DEBUG_KMS("XXX: leaving lock mode_config\n");
 	mutex_unlock(&dev->mode_config.mutex);
 }
 
@@ -1172,6 +1182,7 @@ void ironlake_edp_panel_vdd_off(struct intel_dp *intel_dp, bool sync)
 		 * time from now (relative to the power down delay)
 		 * to keep the panel power up across a sequence of operations
 		 */
+        DRM_DEBUG_KMS("XXX: schedule work (msecs_to_jiffies) intel_dp=%p\n", intel_dp);
 		schedule_delayed_work(&intel_dp->panel_vdd_work,
 				      msecs_to_jiffies(intel_dp->panel_power_cycle_delay * 5));
 	}
@@ -3272,9 +3283,13 @@ void intel_dp_encoder_destroy(struct drm_encoder *encoder)
 	i2c_del_adapter(&intel_dp->adapter);
 	drm_encoder_cleanup(encoder);
 	if (is_edp(intel_dp)) {
+        DRM_DEBUG_KMS("XXX: cancel_delayed_work_sync intel_dp=%p dev=%p\n", intel_dp, dev);
 		cancel_delayed_work_sync(&intel_dp->panel_vdd_work);
+        DRM_DEBUG_KMS("XXX: before lock mode_config\n");
 		mutex_lock(&dev->mode_config.mutex);
+        DRM_DEBUG_KMS("XXX: inside lock mode_config\n");
 		ironlake_panel_vdd_off_sync(intel_dp);
+        DRM_DEBUG_KMS("XXX: leaving lock mode_config\n");
 		mutex_unlock(&dev->mode_config.mutex);
 	}
 	kfree(intel_dig_port);
@@ -3655,6 +3670,7 @@ intel_dp_init_connector(struct intel_digital_port *intel_dig_port,
 	connector->interlace_allowed = true;
 	connector->doublescan_allowed = 0;
 
+    DRM_DEBUG_KMS("XXX: INIT_DELAYED_WORK intel_dp=%p dev=%p\n", intel_dp, dev);
 	INIT_DELAYED_WORK(&intel_dp->panel_vdd_work,
 			  ironlake_panel_vdd_work);
 
@@ -3717,9 +3733,13 @@ intel_dp_init_connector(struct intel_digital_port *intel_dig_port,
 	if (!intel_edp_init_connector(intel_dp, intel_connector)) {
 		i2c_del_adapter(&intel_dp->adapter);
 		if (is_edp(intel_dp)) {
+            DRM_DEBUG_KMS("XXX: cancel_delayed_work_sync intel_dp=%p dev=%p\n", intel_dp, dev);
 			cancel_delayed_work_sync(&intel_dp->panel_vdd_work);
+            DRM_DEBUG_KMS("XXX: before lock mode_config\n");
 			mutex_lock(&dev->mode_config.mutex);
+            DRM_DEBUG_KMS("XXX: inside lock mode_config\n");
 			ironlake_panel_vdd_off_sync(intel_dp);
+            DRM_DEBUG_KMS("XXX: leaving lock mode_config\n");
 			mutex_unlock(&dev->mode_config.mutex);
 		}
 		drm_sysfs_connector_remove(connector);