-ExecStart=/usr/AGL/HomeScreen/HomeScreen
-Environment=QT_IVI_SURFACE_ID=1000 QT_WAYLAND_SHELL_INTEGRATION="ivi-shell" LD_PRELOAD=/usr/lib/libEGL.so
+ExecStartPre=/bin/systemctl --user is-active WindowManager
+ExecStart=/usr/AGL/homescreen/HomeScreen
+# 4194304(= 1 << 22) is special surface id for HomeScreen
+Environment=QT_IVI_SURFACE_ID=4194304 QT_WAYLAND_SHELL_INTEGRATION=ivi-shell LD_PRELOAD=/usr/lib/libEGL.so.1