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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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to mesa in Ubuntu.
https://bugs.launchpad.net/bugs/1752053

Title:
  nvidia-390 fails to boot graphical display

Status in mesa package in Ubuntu:
  Fix Released
Status in nvidia-graphics-drivers-390 package in Ubuntu:
  Fix Released
Status in xserver-xorg-video-nouveau package in Ubuntu:
  Invalid

Bug description:
  I'm using Bionic with the new 4.15 kernel. I've been using the
  nvidia-384 driver with no problem for a while.  Today I issued "sudo
  apt-get upgrade" and I was prompted to upgrade the nvidia driver to
  the nvidia-390.  After installing the driver and rebooting, I was only
  able to boot in to the tty terminal.  The graphical display failed to
  boot.  I have had similar problems with nvidia driver version 390 with
  Arch Linux and with Open Suse Tumbleweed.

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