SUMMARY: As per topic. Machine boots up to SDDM, Plasma(Wayland) is selected, enter sign-in password, and machine completely locks up. STEPS TO REPRODUCE 1. Boot computer 2. Sign in to Plasma (Wayland) at SDDM OBSERVED RESULT Machine instantly locks up. Sometimes, I might be able to SSH in, but dmesg only prints a bunch of Nouveau FIFO engine fault errors EXPECTED RESULT PLasma Wayland session starts normally. SOFTWARE/OS VERSIONS Linux/KDE Plasma: OpenSUSE Leap 15.0 (available in About System) KDE Plasma Version: 5.12 ADDITIONAL INFORMATION It's almost definitely a Plasma / KWin fault as i have done the following: - Upgrade the default OpenSUSE kernel to a vanilla 4.18 kernel from kernel.org. Lockup still occurs upon sign in - Tested a Wayland session with Gnome successfully - Upgraded Plasma to 5.14 with the repo recommended by OpenSUSE here and lockup still occurs - Booted with nouveau.noaccel=1 and Plasma Wayland successfully loads but with terrible performance
>dmesg only prints a bunch of Nouveau FIFO engine fault errors Sounds pretty critical. Please attach those messages. Is kwin_wayland running after? Can you get a backtrace of it's current state. Please also attach ~/.local/share/sddm/wayland-session.log
Created attachment 116966 [details] kernel demsg The last and most important part of the kernel dmesg log containing Nouveau information. Everything else above it was not relevant.
Created attachment 116967 [details] wayland-session.log entries SDDM/wayland-session.log entries
Created attachment 116968 [details] kwin_wayland backtrace Backtrace for kwin_wayland. I think this one is useless since it complains about too much missing information.
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logs attached.
Just to add on: this behavior is observed in a nested kwin_wayland session as well under Weston. Even though plasmashell is launched in a windowed kwin_wayland process, it locks up the entire system.
Anything that locks up the entire system is generally an issue at a lower level than kwin/plasma. Sorry, but this seems more like a mesa/nouveau problem. I don't think there's much we can do.