diff -rupN lightdm-1.2.2.org/src/vt.c lightdm-1.2.2-VTpatch/src/vt.c
--- lightdm-1.2.2.org/src/vt.c	2012-04-19 01:29:23.000000000 +0200
+++ lightdm-1.2.2-VTpatch/src/vt.c	2012-06-20 10:33:47.898146259 +0200
@@ -95,7 +95,7 @@ vt_set_active (gint number)
 #endif
 }
 
-static gboolean
+gboolean
 vt_is_used (gint number)
 {
     GList *link;
diff -rupN lightdm-1.2.2.org/src/vt.h lightdm-1.2.2-VTpatch/src/vt.h
--- lightdm-1.2.2.org/src/vt.h	2012-04-19 01:29:23.000000000 +0200
+++ lightdm-1.2.2-VTpatch/src/vt.h	2012-06-20 10:35:48.130149351 +0200
@@ -14,6 +14,8 @@
 
 #include <glib-object.h>
 
+gboolean vt_is_used (gint number);
+
 gint vt_get_active (void);
 
 gint vt_get_unused (void);
diff -rupN lightdm-1.2.2.org/src/xserver-local.c lightdm-1.2.2-VTpatch/src/xserver-local.c
--- lightdm-1.2.2.org/src/xserver-local.c	2012-04-19 01:29:23.000000000 +0200
+++ lightdm-1.2.2-VTpatch/src/xserver-local.c	2012-06-15 14:16:51.847135083 +0200
@@ -136,10 +136,17 @@ xserver_local_new (void)
         gint active_vt = vt_get_active ();
         if (active_vt >= vt_get_min ())
         {
-            g_debug ("X server %s will replace Plymouth", xserver_get_address (XSERVER (self)));
-            self->priv->replacing_plymouth = TRUE;
-            self->priv->vt = active_vt;
-            plymouth_deactivate ();
+            if (vt_is_used (active_vt))
+            {
+                g_debug ("Plymouth now seems to be running on VT %d, which is already used by another X server", active_vt);
+            }
+            else
+            {
+                g_debug ("X server %s will replace Plymouth", xserver_get_address (XSERVER (self)));
+                self->priv->replacing_plymouth = TRUE;
+                self->priv->vt = active_vt;
+                plymouth_deactivate ();
+            }
         }
         else
             g_debug ("Plymouth is running on VT %d, but this is less than the configured minimum of %d so not replacing it", active_vt, vt_get_min ());