Index: terminal/terminal-app.c
===================================================================
--- terminal/terminal-app.c	(revision 20337)
+++ terminal/terminal-app.c	(working copy)
@@ -345,6 +345,7 @@
 static GdkScreen*
 terminal_app_find_screen (const gchar *display_name)
 {
+  GdkColormap *colormap;
   const gchar *other_name;
   GdkDisplay  *display = NULL;
   GdkScreen   *screen = NULL;
@@ -406,6 +407,21 @@
       g_object_ref (G_OBJECT (screen));
     }
 
+  /* check if we already checked this screen */
+  if (g_object_get_data (G_OBJECT (screen), "terminal-checked-screen") == NULL)
+    {
+      /* check if we can use ARGB visual for this screen */
+      colormap = gdk_screen_get_rgba_colormap (screen);
+      if (G_LIKELY (colormap != NULL))
+        {
+          /* use ARGB visual for all windows on this screen */
+          gdk_screen_set_default_colormap (screen, colormap);
+        }
+
+      /* mark this screen as handled */
+      g_object_set_data (G_OBJECT (screen), "terminal-checked-screen", GINT_TO_POINTER (1));
+    }
+
   return screen;
 }