In case it helps anyone who's a total newbie like me, install xscreensaver. It will take over the blanking and switching off of your screen as well as allow you to lock the machine when it times out (tick "Lock Screen After" on the "Display Modes" tab). That seems to work for me.
In case it helps anyone who's a total newbie like me, install xscreensaver. It will take over the blanking and switching off of your screen as well as allow you to lock the machine when it times out (tick "Lock Screen After" on the "Display Modes" tab). That seems to work for me.