Comment 15 for bug 1672033

The following line is a bit suspicious
>Mär 21 20:10:20 arvlin /usr/lib/gdm3/gdm-x-session[3618]: (II) systemd-logind: releasing fd for 226:0

afair that would mean the Xorg/nvidia driver no longer has access to GPU once NVIDIA is trying to load/detect monitors, however strangely its also showing up in your other "working" log.

It might be worth filing an upstream bug against gdm.