I'm experiencing the same issue. Ubuntu 12.10 upgrade from 12.04. I can lock the screen using ctrl+alt+l, but it won't lock automatically after the time interval selected in All Settings -> Brightness and Lock -> Lock screen after:
I'm experiencing the same issue. Ubuntu 12.10 upgrade from 12.04. I can lock the screen using ctrl+alt+l, but it won't lock automatically after the time interval selected in All Settings -> Brightness and Lock -> Lock screen after: