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I am not an expert, but I thought that nvidia can render monitors attached to the intel card (Nvidia Prime).
That's unrelated, you can run the server on the nvidia GPU and depending on
xrandr --listproviders it can offload the result to the IGP.
But you cannot run the nvidia GLX library with the modesetting driver.
Post that file [Using config file: "/etc/X11/xorg.conf"] - and your system journal.
sudo journalctl -b | curl -F 'file=@-' 0x0.stOnline
I stopped sddm and started gdm. I have no issue. I do not know if it is temporary and the issue will come back. It is also possible that one of the updates fixed it. I have to wait a few days before I can call the issue solved.
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THe problem has never been the DM but your sesssion.
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