I am using laptop, connected to docking station with 2 external monitors. The problem is that when I want to lock the OS with Super + L keys, elemenntary OS is first shutting down the monitors for few seconds, then starting them again and staying like this showing the login screen, but not shutting them down again. I want the monitors to stay shut unless I want to unlock and move the mouse or press keyboard. I thought that this can be caused by some notifications coming, but it turned out that even with no started applications, the same is happening. Please, advise how to resolve that or if it is a bug and you should fix it!
I guess this is related to the same thing described here. I am facing the exact same behavior: https://github.com/elementary/greeter/issues/155