I think it actually uses GStreamer as a backend which is a bit unfortunate because HDR support is either nonexistent or hit or miss with GStreamer at the moment. I’ve also had worse performance with GST over MPV, but most videos and codecs are fine. It certainly integrates better with the GNOME environment which may have been a driving factor in the decision to use it over MPV.

It’s not blurred, but the UI for Showtime (GNOME Video Player) looks pretty similar with the edge to edge video playback and transparent controls overlay: https://gitlab.gnome.org/GNOME/showtime

Just checked the ownership of the monitor config, it was gdm:root, so I changed the ownership to gdm:gdm and rebooted. Still facing the same issue.

Didn’t see any error messages in the logs about not being able to load wayland, but just to confirm, I ran loginctl show-session {gdm session id} -p Type which returns Type=wayland, so it’s definitely running under wayland. I have an AMD GPU though so I wouldn’t expect there to be any problems there.

Not seeing anything else weird in the logs that are jumping out as strange to me either, so a bit at a loss here. Any other suggestions?