Black screen on SDDM/Wayland on first boot with Nvidia card about bazzite HOT 7 OPEN

Some more notes:

The above problem was reproduced in a linux vm with pci passthrough (vfio).
It seems that the problem occurs when both a spice display and the pci passthrough are assigned to the vm.

After removing spice display and virtio video (and all their dependencies) from vm details in virt-manager, bazzite sddm/plasma with wayland seems to work normally.

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Keep in mind that this is something I tried for the first time, so I don't know if its a plasma-wayland with multiple video cards (virtio vga/spice + real pci card) issue or a nvidia driver issue.

In any case I'll leave it open a little bit for further feedback, and I'll close this soon because it seems irrelevant with the bazzite project.

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I'm also getting this without doing it from a VM. A maintainer on discord mentioned that this could be an HDR bug.

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Yeah I saw similar mentions to HDR problems with the nvidia 555 driver:
https://bbs.archlinux.org/viewtopic.php?id=297236
https://bugs.kde.org/show_bug.cgi?id=488941
https://forums.developer.nvidia.com/t/nvidia-555-52-04-plasma-6-1-wayland-screen-turn-off-on-login/297197

I'm not sure this is the case here though, because I checked in ~/.config/kwinoutputconfig.json, and both "highDynamicRange" and "wideColorGamut" where set to false.

The problem went away only when I removed the spice/virtio device from virt-manager in my case which is really inconvenient because I need to plug a real monitor to my gpu that is being passed through in order to see the vm output

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Yes, I personally don't believe it's an HDR issue because I'm having the same problem from a live USB and it generally has HDR disabled by default. I don't know enough to troubleshoot the issue though. I can provide more logs, I just need to know what commands to run.

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This seems really close to what I've been experiencing. Looks like it's potentially a bug with KDE

https://bugs.kde.org/show_bug.cgi?id=488941

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Another discussion that might have relevant info:
https://forums.developer.nvidia.com/t/555-release-feedback-discussion/293652/45?page=3

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