diff --git a/sys/dev/drm2/drm_dp_iic_helper.c b/sys/dev/drm2/drm_dp_iic_helper.c
index 71319e3..9f9044f 100644
--- a/sys/dev/drm2/drm_dp_iic_helper.c
+++ b/sys/dev/drm2/drm_dp_iic_helper.c
@@ -206,13 +206,16 @@ static int
 iic_dp_aux_attach(device_t idev)
 {
 	struct iic_dp_aux_data *aux_data;
+	int ret;
 
 	aux_data = device_get_softc(idev);
 	aux_data->port = device_add_child(idev, "iicbus", -1);
 	if (aux_data->port == NULL)
 		return (ENXIO);
 	device_quiet(aux_data->port);
-	bus_generic_attach(idev);
+	ret = bus_generic_attach(idev);
+	DRM_INFO("%s: aux_data->port=%p bus_generic_attach=%d\n",
+	    __func__, aux_data->port, ret);
 	return (0);
 }