My second day of vacation. Started up my workstation. Primary
monitor stopped working in the middle of the session. Also that port
("DisplayPort-3") simply vanished from the list, as if the graphic
card didn't have that port.
  Not sure if it's the monitor, the graphic card, the DP-cable or
even the PCIe slot on the main board.
  Really not something you wanna debug at 6 AM while on vacation.
Meh.