this post was submitted on 01 Jul 2024
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Is one of your monitors HDR? I've been getting similar issues (EndevourOS) ever since upgrading to 555, where both of my monitors are black/no signal when logging into Wayland. Unplugging my primary monitor fixes the secondary monitor, and it seems like HDR is the problem in my case - https://bugs.kde.org/show_bug.cgi?id=488941
Simply deleting kwinoutputconfig didn't fix the problem for me but I haven't tried setting it as read-only yet (Probably a good idea to back it up first). My X11 is working normally so I'll stick with that until this bug is resolved.
Main monitor does support HDR but I never have it enabled. I'll give this a shot when I get the chance
Connecting my second display with a display port rather than HDMI seems to have solved the issue