k, that went south.
I can't startx as a user anymore, but i can as root. I created a test-account, same problem:
[email protected]:/home/dude# grep EE /home/dude/.local/share/xorg/Xorg.0.log
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[ 65.494] (EE) systemd-logind: failed to get session: The name org.freedesktop.login1 was not provided by any .service files
[ 65.532] (EE) modeset(0): drmSetMaster failed: Permission denied
[ 65.532] (EE)
[ 65.532] (EE) AddScreen/ScreenInit failed for driver 0
[ 65.532] (EE)
[ 65.532] (EE)
[ 65.532] (EE) Please also check the log file at "/home/dude/.local/share/xorg/Xorg.0.log" for additional information.
[ 65.532] (EE)
[ 65.538] (EE) Server terminated with error (1). Closing log file.
[email protected]:/home/dude#