[Compat]: Return to Castle Wolfenstein is not running in full screen

[FernandoMMuniz]

Game name

Return to Castle Wolfenstein

Steam AppID

9010

Proton-CachyOS version

proton-cachyos-11.0-20260429

GPU

NVIDIA GeForce GTX 1650

Video driver version

595.71.05

Kernel version

7.0.3-1-cachyos (64-bit)

Full system information report

https://gist.github.com/FernandoMMuniz/b2c0be736f8095472e0d533a8f42c24a

Please confirm the following before submitting

• I haven't found an existing compatibility report for this game.
• I have checked whether there are updates for my system available.
• I have verified the issue is present when using Proton-CachyOS-SLR from this repository.
• I haven't encountered this issue using an official Proton release (Proton, Proton Experimental, or Proton Bleeding Edge).

Symptoms

proton-cachyos-11.0-20260429

Valve's Proton 11 beta and Proton Experimental are able to put the game in full screen.

Proton 11 (Beta) and Proton Experimental

Steps to reproduce

Launch the game with proton-cachyos-11.0-20260429
Then launch the game with Valve's Proton 11 Beta or Proton Experimental

Log from Proton-CachyOS-SLR

steam-9010.log

Log from recent Proton Experimental

steam-9010.log

Log from Proton-CachyOS Native (if relevant)

No response

Additional context

No response

[loathingKernel]

Thank you, so from your log I assume this is an issue only when using winewayland. Does it happen when not using it? This should absolutely have been mentioned from the start in the issue report, and I assumed it was so, but needed either logs, or it being mentioned in the reproductions steps to be certain. If I just launched the game exactly as described, I would not encounter the issue.

[FernandoMMuniz]

Both issues don't happen on proton-cachyos-11.0-20260429 after removing PROTON_ENABLE_WAYLAND=1 from /etc/environment/ and rebooting my notebook.

steam-9010.log