diff --git a/drmconnector.cpp b/drmconnector.cpp
index ccb38e2..247f56b 100644
--- a/drmconnector.cpp
+++ b/drmconnector.cpp
@@ -67,11 +67,19 @@
   display_ = display;
 }
 
-bool DrmConnector::built_in() const {
+bool DrmConnector::internal() const {
   return type_ == DRM_MODE_CONNECTOR_LVDS || type_ == DRM_MODE_CONNECTOR_eDP ||
          type_ == DRM_MODE_CONNECTOR_DSI || type_ == DRM_MODE_CONNECTOR_VIRTUAL;
 }
 
+bool DrmConnector::external() const {
+  return type_ == DRM_MODE_CONNECTOR_HDMIA;
+}
+
+bool DrmConnector::valid_type() const {
+  return internal() || external();
+}
+
 int DrmConnector::UpdateModes() {
   int fd = drm_->fd();