[dsmid]

Wouldn't this simple upstart script be better than fiddling with cron ?

/etc/upstart/battery_saver.conf

start on framework_ready
stop on stopping framework

respawn

script
    while true
    do
        lipc-wait-event com.lab126.powerd readyToSuspend || true
        echo "mem" > /sys/power/state || true
        # Gives us some time to react if something goes wrong
        sleep 60
    done
end script