Linux screen lockers don't seem so very secure, at least not in the past [1, 2, 3]. But is there any very secure OpenBSD screen locker?
(Or perhaps OpenBSD uses the same desktop related source code as Linux and therefore would have similar problems?)
Ideally, I'd like to be able to leave my laptop unattended, and know that after a few minutes, it'll screen lock itself, so it gets as safe as if the laptop had been powered off and full disk encrypted (all disks including swap). Is this possible with OpenBSD and screen lockers? Or would I have to configure the laptop to actually power itself off?
Related question, for Linux: What is the most secure way to lock a Linux Distros Desktop?