SDDM is too bright and vivid when I log out with HDR enabled

[Julian_Lai]

If I have enabled HDR in Plasma6.1 and log out, the SDDM is too bright and vivid.

[ernestowg]

I’m having this same issue in Plasma 6.3. I’ve been ignoring it, but a fix would be nice.

[M.Karrde]

Does that mean when HDR is not enabled in SDDM (plasma settings not exported to SDDM) or with a HDR enabled SDDM it is too bright and vivid. With the latter, with the breeze default I don’t think so (but that could be down to personal taste).

Maybe change the SDDM background image to something darker?
I don’t think it will be fixed until

# A Roadmap for a modern Plasma Login Manager

Plasma's login experience is an area that we know requires some improvement — it works OK in the basic case, but it's very barebones and doesn't handle anything beyond that. This is a companion discussion topic for the original entry at http://blog.davidedmundson.co.uk/blog/a-roadmap-for-a-modern-plasma-login-manager/

comes out and the “old” SDDM basically gets replaced.

[Zamundaaa]

This means you’re using SDDM on Xorg, which can’t deal with the display being in HDR mode (not even turning it off). Switch it to use kwin_wayland, and it’ll work as you’d expect

[M.Karrde]

Didn’t know HDR is even supported with Xorg.

Edit: Okay I think I got it, maybe, if SDDM runs on Xorg and only after the login to KDE it switches to wayland? How to switch that, no idea. Have never even tried to run Xorg again since i switched the Distro when Plasma 6 was released.

[Krovikan]

Your SDDM is always looks like this? (see the yellow arrow):

Regards

[M.Karrde]

@Krovikan

Your SDDM is always looks like this?

Yes, but I think that does not matter here, as on what SDDM itself runs on.
After a short re-search I found this article about setting up /etc/sddm.conf.d/10-wayland.conf which I probably / definitely did when installing Arch back then.