There is an issue when trying to switch to fullscreen. What happens is that game window disappears, mouse pointer disappears but you don't see game screen. You see desktop and the icons for the game (KDE taskbar). Moving the mouse you can hear UI sounds like when pointer is hovering over menu items but game display is not visible for some reason.
This is with kernel 6.4.11, Mesa 23.1.6, KDE 5.27.5 (Wayland).
Edit: Also with Proton 7.0 game can freeze during warning-text when starting the game if it is starting in fullscreen mode.
proton 7.0x1 2023-08proton 5.0-10bx1 2020-12
Compatibility Report
System Information
I confirm:
steam-741140_lavDevenum.log
Symptoms
I was going to do a whitelist request but it's not platinum platinum yet I guess. By installing the two things below you can get video working. I've played up to the end of chapter 1 where the opening plays. No issue that I noticed.
Reproduction