Hi, Arch runs without any issues, so I randomly discovered this: [rocketmouse@archlinux ~]$ grep EE /var/log/Xorg.0.log [ 26.702] Current Operating System: Linux archlinux 3.10.61-rt65-1-rt-lts x86_64 [ 27.745] (EE) systemd-logind: failed to get session: PID 437 does not belong to any known session [rocketmouse@archlinux ~]$ ps aux | grep 437 root 437 2.1 2.2 297136 84320 tty7 Ssl+ Sep22 32:09 /usr/lib/xorg-server/Xorg :0 -seat seat0 -auth /run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch Web research regarding "does not belong to any known session" without experiencing issues leads nowhere. What could be the reason? Regards, Ralf