*** If you're not sure this is actually a bug, instead post about it at https://discuss.kde.org If you're reporting a crash, attach a backtrace with debug symbols; see https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports *** SUMMARY STEPS TO REPRODUCE 1. Be on Nixos (maybe its nixos specific, maybe the unstable channel as I am on that) 2. Install KDE plasma 3. Have a monitor and plug it in 4. POTENTIAL FACTOR -> Have a igpu and dgpu (nvidia) with optimus 5. Try the wayland session OBSERVED RESULT The wayland session, when I start it from SDDM, it will remain as a black screen, with a loading icon sometimes, then after a short while, like 10 or more seconds, it seemingly crashes and sends me back to sddm. This is not a issue with x11 (on multimonitor) EXPECTED RESULT It should load up the same way x11 does, and not crash and return to sddm SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: NixOS 24.11.20240627.b2852eb (Vicuna) x86_64 (available in About System) KDE Plasma Version: 6.1.1 KDE Frameworks Version: 6.3.0 Qt Version: 6.7.2 ADDITIONAL INFORMATION I made a post about this on reddit including a VIDEO of the issue, and I mention some things about hardware, https://www.reddit.com/r/linuxquestions/comments/1dr4q1u/wayland_and_multimonitor_not_working_on_nixos/
This issue has been solved, I will close this issue, I haven't tested x11 or gnome, but ill update this issue (maybe) when I do, also this is the version I'm on now: Linux 6.8.12, NixOS, 24.11 (Vicuna), 24.11.20240818.8a33541 If anyone know what happened and where the patch happened I hope you can comment to this issue.
This issue is still present, I just had a one off where wayland suddenly worked, anyways here are some log files if this helps: Systemctl status: https://pastebin.com/tMMDs2jA Journalctl: https://pastebin.com/APq2ZcPv
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Please report this issue to SDDM developers. https://github.com/sddm/sddm