To me it looks that there is something broken wider than what most comments 
touch.
On my laptop with a NVIDIA Corporation GK107M [GeForce GT 750M] (prime) card, 
since 17.10 (including 18.04):
- nouveau drivers work very poorly with Xorg: too slow to play video (tearing, 
drop frames, etc).
- nouveau drivers work very poorly with Xorg: too slow to play video (tearing, 
drop frames, etc).
- nvidia-340 drivers with prime selection of both nvidia and intel: No Xorg, no 
Wayland.
- nvidia-390 drivers with prime selection of nvidia: No Xorg, Waylang stuck in 
login loop.
- nvidia-390 drivers with prime selection of intel on Xorg: too slow to play 
video (tearing, drop frames, etc).
- nvidia-390 drivers with prime selection of intel on Wayland: everything seems 
to work.

I would prefer to run Xorg on 18.04 because Wayland on 17.10 crashed one
in a while probably due to extensions.

Ping if more info is needed (logs, tests) or it this should be moved to
its own ticket.

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https://bugs.launchpad.net/bugs/1752053

Title:
  nvidia-390 fails to boot graphical display

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