Frédéric composed on 2018-01-08 15:41 (UTC+0100):
when I type /usr/sbin/fbset from a vtty (Ctrl+Alt+F2), this is what
open /dev/fb0: no such file or directory
That's bad, probably indication of low level problem, kernel or video support in
the kernel, not at all a KDE or SDDM fault. Maybe your eradication of
proprietary NVidia support was incomplete. Someone else will have to help you
figure out if there is any NVidia remaining to be removed, something module
and/or blacklist related in /etc/ I suppose.
Maybe there would be a clue from output of
dmesg | grep -i failed
journalctl | grep -i failed
posted to the users list. This list seems to have a very small user base.
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