def _is_service_active_dbus(system_bus, service_name):

    systemd = system_bus.get_object("org.freedesktop.systemd1", "/org/freedesktop/systemd1")

    try:
        unit_path = systemd.GetUnit("%s.service" % service_name, dbus_interface="org.freedesktop.systemd1.Manager")
    except dbus.exceptions.DBusException:
        return False

    optimus_manager_interface = system_bus.get_object("org.freedesktop.systemd1", unit_path)
    properties_manager = dbus.Interface(optimus_manager_interface, 'org.freedesktop.DBus.Properties')
    state = properties_manager.Get("org.freedesktop.systemd1.Unit", "SubState")

    return state == "running"