Remove session lock?

I'm trying to setup a machine to autostart at a given time, do record something and then shutdown. Autostarting works with: echo `date -d 'YYYY-MM-DD hh:mm:ss ' '+%s'` > /sys/class/rtc/rtc0/wakealarm but this seems to work only if I put the computer in suspend mode (if I shutdown the computer does not come back to life). However, when the computer starts from suspend, the session is locked... and I am not there to unlock it. I've searched TDE's control panel without luck. Is there a way to remove the auto-lock feature? Thierry