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/020 and set nvidia_drm modeset=1 but
then my external monitors didn't work
I should add that the "fix" I reported is only a narrow fix. The
internal display works. But external displays don't work if you have
nvidia drivers, gdm3 and if you are using modeset=1
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Closed per comment #20. Discussion continues in bug 1714881...
** Changed in: gdm3 (Ubuntu)
Status: New => Invalid
** Changed in: nvidia-graphics-drivers-375 (Ubuntu)
Status: New => Invalid
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Daniel, with the latest 17.10 the nvidia problems are now more specific and
easier to reproduce.
Neither of my Thinkpads gets to the login screen in discrete Nvidia mode iff
modeset=1 is used.
In hybrid graphics, the session starts, I suspect this is due to the
intel driver being available.
** Summary changed:
- gdm3 nvidia modeset=1 is broken, external screens don't work
+ gdm3 nvidia modeset=1 is broken, external screens don't work on a Thinkpad p50
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