After leaving my laptop for a while, my Kubuntu session closed. (I'm not sure which of the various timeout criteria caused it.) So I got a screen that said my session was locked and I needed to provide my password to unlock it. That's a nuisance, not a big problem, but I'd like to fix it so timed-out sessions don't lock the session.
I assume there's something in System Settings to disable the lockout -- but where? I looked in Power Management and found a setting "Lock screen on resume", but it's unchecked. Is this possibly a bug?