I am having trouble getting a LG external display working. The issues occurs on two different machines with 16.04. I have tried my best to debug the issue, but nothing seems to work.

-The external display worked in 14.04
-I have a different test monitor that works over dvi, but I need to use the LG display over displayport.
-I have up to date Nvidia drivers using (Titan X pascal and 980Ti).
-Both machines recognize the LG display as it shows the details in display Settings, but no picture is shown on the LG monitor.

Any help would be great.