[BUG] [610.57.04] [RTX 4090] Xid 56 / 120 when transitioning from plasmalogin to kwin_wayland with differing monitor configs

Hi,

I’m on the following system:

Operating System: Fedora Linux 44
KDE Plasma Version: 6.7.4
KDE Frameworks Version: 6.29.0
Qt Version: 6.11.2
Kernel Version: 7.1.12-200.fc44.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 32 × AMD Ryzen 9 7950X3D 16-Core Processor
Memory: 64 GiB of RAM (62.4 GiB usable)
Graphics Processor: NVIDIA GeForce RTX 4090
Manufacturer: Gigabyte Technology Co., Ltd.
Product Name: B650 AORUS ELITE AX ICE
System Version: Default string-WCP

If I change my plasmalogin monitor output settings to be different from the settings on my Desktop, upon reboot and logging in, the system will hang with black screens and a Xid 56 / 120 error in the log. This is irrecoverable and ssh/reboot will not work, emitting the SYSRQ keys however does.

I tried disabling Vrr in kwinoutputconfig for both PlasmaLogin and Desktop, to no effect, and also the same with HDR.

The only solution I found so far is to sudo cp ~/.config/kwinoutputconfig.json /var/lib/plasmalogin/.config/kwinoutputconfig.json && chown plasmalogin:plasmalogin /var/lib/plasmalogin/.config/kwinoutputconfig.json

I attach my nvidia bug report logs. Thank you for any assistance!

nvidia-bug-report.log.gz (379.0 KB)