diff --git a/hw/xfree86/modes/xf86RandR12.c b/hw/xfree86/modes/xf86RandR12.c
index 8b13758..0280450 100644
--- a/hw/xfree86/modes/xf86RandR12.c
+++ b/hw/xfree86/modes/xf86RandR12.c
@@ -839,6 +839,9 @@ xf86RandR12OutputSetProperty (ScreenPtr pScreen,
     if (output->funcs->set_property == NULL)
 	return TRUE;
 
+    if (!output->scrn->vtSema)
+	return TRUE;
+
     /*
      * This function gets called even when vtSema is FALSE, as
      * drivers will need to remember the correct value to apply