diff --git a/pmos/rotate.sh b/pmos/rotate.sh
index 0ab90e6..ed7d59d 100755
--- a/pmos/rotate.sh
+++ b/pmos/rotate.sh
@@ -39,7 +39,6 @@ function usage() {
     echo "                   then the first item will be chosen"
     echo "  without configure the input device for the current orientation"
     echo ""
-    exit 1
 }
 
 
@@ -145,7 +144,9 @@ function configure_input() {
 
 # parse arguments
 SHOW_USAGE=
+CHANGED=
 while [ "$#" != "0" ]; do
+  IS_CMD=1
   if [ "$1" = "kbon" ]; then
     echo "open screen keyboard"
     run_keyboard
@@ -162,12 +163,13 @@ while [ "$#" != "0" ]; do
     rotate_screen "$ROT"
   else
     echo "unknown command: $1"
-    SHOW_USAGE=1
+    IS_CMD=
   fi
+
+  if [ -n "$IS_CMD" ]; then CHANGED=1; else SHOW_USAGE=1; fi
   shift
 done
 
-
-configure_input
 [ -z "$SHOW_USAGE" ] || usage
+( [ -n "$SHOW_USAGE" ] && [ -z "$CHANGED" ] ) || configure_input