commit 66576dfe24f93b22146e436aea761bc5a3b547cf
Author: Stéphane Graber <stgraber@ubuntu.com>
Date: 2013-01-16 10:18:20 (GMT)
    display: Add support for 21:9 displays
    https://bugzilla.gnome.org/show_bug.cgi?id=691803 

--- gnome-control-center-3.6.3.orig/panels/display/cc-display-panel.c
+++ gnome-control-center-3.6.3/panels/display/cc-display-panel.c
@@ -763,6 +763,9 @@ make_resolution_string (int width, int h
     case 17:
       aspect = "16:9";
       break;
+    case 23:
+      aspect = "21:9";
+      break;
     case 12:
       aspect = "5:4";
       break;
