--- gnome-session-2.20.0/gnome-session/logout.c.prevent-fade-ltsp	2007-09-17 20:36:00.000000000 +0200
+++ gnome-session-2.20.0/gnome-session/logout.c	2007-09-18 18:14:47.000000000 +0200
@@ -342,8 +342,9 @@ display_gui (void)
 
   gtk_widget_show (invisible);
 
-  iris_effect_enabled = gdk_screen_is_composited (screen) ||
-	                !GTK_IS_ACCESSIBLE (gtk_widget_get_accessible (invisible));
+  iris_effect_enabled = (gdk_screen_is_composited (screen) ||
+	                !GTK_IS_ACCESSIBLE (gtk_widget_get_accessible (invisible))) &&
+			!g_getenv("LTSP_CLIENT");
   grab_xserver = !gdk_screen_is_composited (screen);
 
   /* Only create a managed window if a11y is enabled */