Ubuntu 16.04 Brightness & Lock - Screen does not turn off

I have 16.04 LTS on a Dell XPS13 (L321X) and an external LG display connected.

I set it up to: -dim the screen -turn screen off when inactive for 10 minutes -lock ON -lock screen as soon as screen turns off -require password when waking from suspend

Problem is that after 10 minutes, both displays get turned off but right after come back on showing the lockscreen. They don't stay off.

This is a fresh 16.04 install.

With my previous installed version, 12.04, this did not happen.

Any known bugs that I may be hitting?

Thanks

I found out there was a bug related to this unexpected behavior. Bug #1292041.

This got fixed recently with the release of a Unity patch. See https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1292041

After updating the OS, it now works well on my setup, the monitors blank off, and stay that way until I hit a key or move the mouse.