--- linux-3.13-rc4/drivers/gpu/drm/i915/intel_dp.c	2013-12-15 21:31:33.000000000 +0100
+++ linux-3.13-rc4-patched/drivers/gpu/drm/i915/intel_dp.c	2013-12-21 17:31:48.268440224 +0100
@@ -555,7 +555,7 @@
 		if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_ACK)
 			break;
 		else if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_DEFER)
-			udelay(100);
+			udelay(500);
 		else
 			return -EIO;
 	}
@@ -1164,6 +1164,15 @@
 
 	intel_dp->want_panel_vdd = false;
 
+	if (cancel_delayed_work(&intel_dp->panel_vdd_work)) {
+	  struct drm_device *dev = intel_dp_to_dev(intel_dp);
+
+	  mutex_unlock(&dev->mode_config.mutex);
+	  cancel_delayed_work_sync(&intel_dp->panel_vdd_work);
+	  mutex_lock(&dev->mode_config.mutex);
+	}
+
+
 	if (sync) {
 		ironlake_panel_vdd_off_sync(intel_dp);
 	} else {
@@ -2158,6 +2158,7 @@ intel_get_adjust_train(struct intel_dp *intel_dp,
 			v = this_v;
 		if (this_p > p)
 			p = this_p;
+		udelay(300);
 	}
 
 	voltage_max = intel_dp_voltage_max(intel_dp);