I just found out about this. I wanted to get rid of the screen tearing
that I observed on my Nitro AN515-53 laptop running Ubuntu 18.04.3 LTS
with NVIDIA GeForce GTX 1050 Mobile GPU.

I used https://askubuntu.com/a/1111020 and set nvidia_drm modeset=1 but
then my external monitors didn't work after the reboot. So I switched
from gdm3 to lightdm and that does the trick for me.

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https://bugs.launchpad.net/bugs/1706474

Title:
  gdm3 nvidia modeset=1 is broken, external screens don't work on a
  Thinkpad p50

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