I have a 16.04 laptop monitoring my IoT stuff. It is constantly Rx/Tx a stream of data via the Serial port and an Arduino Mega. All works great.
I'd like the screen to go black after a period of no keyboard acitivity, but not suspend as that also suspends the data stream.
I know I can set the screen to never turn off in Settings with "Turn screen off after ..." and set it to "Never," to prevent the suspending but that leaves the system security open.
When I need to access that laptop, maybe days later, I want to have to login-screen available before getting the data-screen back again.
How do I do that?