Leap 15.4 - no graphical screen after update

Hello, I updated a Raspi4 running Leap 15.4 and XFCE to current Leap patchlevel. Since then, screen remains black. connection via ssh and journalctl -xb offers an error: https://paste.opensuse.org/45558548 zypper installed the following updates: https://paste.opensuse.org/73935300 Any proposals? Cheers Axel