Use sleep as fake xim server.

xinput-ibus

@@ -1,6 +1,7 @@
 XIM=ibus
-XIM_PROGRAM="/bin/cat /dev/zero"
+# define a fake XIM program
-XIM_ARGS=""
+XIM_PROGRAM="/bin/sleep"
+XIM_ARGS="0xefffffff"
 PREFERENCE_PROGRAM=/usr/bin/ibus-setup
 SHORT_DESC="IBus"
 GTK_IM_MODULE=ibus