Comment 6 for bug 264696

This ought to be fixed somewhere below gdm, either in gnome-session or consolekit. gnome-session has:

static void
do_attempt_shutdown (GsmConsolekit *consolekit)
{
        if (gsm_consolekit_can_stop (consolekit)) {
                gdm_set_logout_action (GDM_LOGOUT_ACTION_NONE);
                gsm_consolekit_attempt_stop (consolekit);
        } else {
                gdm_set_logout_action (GDM_LOGOUT_ACTION_SHUTDOWN);
        }
}