Index: /trunk/src/VBox/Additions/linux/installer/vboxadd.sh
===================================================================
--- /trunk/src/VBox/Additions/linux/installer/vboxadd.sh	(revision 43741)
+++ /trunk/src/VBox/Additions/linux/installer/vboxadd.sh	(revision 43742)
@@ -227,4 +227,9 @@
 {
     lsmod | grep -q "vboxsf[^_-]"
+}
+
+running_vboxvideo()
+{
+    lsmod | grep -q "vboxvideo[^_-]"
 }
 
@@ -314,4 +319,7 @@
         }
     }
+
+    # This is needed as X.Org Server 1.13 does not auto-load the module.
+    running_vboxvideo || $MODPROBE vboxvideo > /dev/null 2>&1
 
     # Mount all shared folders from /etc/fstab. Normally this is done by some