Additional notes:
* When I enable the HDMI port, I used --mode 1920x1080 --scale-from 2840x2160
* I have just discovered that I _can_ reenable the DP using nvidia-settings, 
but ONLY as a mirror-of or BELOW my existing laptop screen. What I cannot do is 
make the DP screen be ABOVE my laptop screen. It's as if using the HDMI port 
(with scale-from?) has locked the laptop screen to X coordinates (0,0).

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https://bugs.launchpad.net/bugs/1853381

Title:
  Using HDMI output breaks displayport permanently

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