AFAIK this is not a bug :(
The NVIDIA driver only supports Xorg or Wayland, but not both.
By default it only supports Xorg. And if you have added modeset=0 then
it only supports Wayland. So yes we would expect Xorg logins to fail
while you have modeset=0.
** Changed in: gdm3 (Ubuntu)
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/1719128
Title:
Automatic login works only for wayland session
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