Has the method to get the session idle time through dbus changed in the recent Ubuntu or my dbus code here is wrong?
#!/usr/bin/env python
import dbus
bus_name = 'org.gnome.ScreenSaver'
obj_path = '/org/gnome/ScreenSaver'
session_bus = dbus.SessionBus()
gs_obj = session_bus.get_object(bus_name, obj_path)
gs_iface = dbus.Interface(gs_obj, bus_name)
print gs_iface.GetSessionIdleTime()
# dbus.exceptions.DBusException: org.freedesktop.DBus.Error.UnknownMethod: No such method 'GetSessionIdleTime'