Hello @stinga11, we're using one issue report per unofficially supported game title, so I've gone ahead and transferred this issue report to https://github.com/ValveSoftware/Proton/issues/5285#issuecomment-4401966921.
proton 11.0x1 2026-05proton experimentalx1 2026-05gamescope -- %command%x1 2026-05
#Affected game(s)
Forza Horizon 5
#App ID
1551360
#System specs:
CPU: Intel i9-10900K
RAM: 64 GB
GPU: AMD RX 5700 XT
Bazzite 43 Plasma 6 - CachyOS Plasma 6- Arch linux Plasma 6 (I was able to replicate the error on all three of my computers)
#Description
Everything has been working fine since I upgraded from Proton experimental-11.0-20260428 to Proton experimental-11.0-20260507. Then I downloaded Proton 11.0-beta2 since I can't go back to Proton experimental-11.0-20260428, and now everything is working fine again.
Suddenly, Forza Horizon 5 started having issues. When launching it through a gamescope-session or from the desktop using gamescope -- %command%, the game appears to start correctly: I can hear audio, and inputs from the controller, keyboard, and mouse seem to register. However, the screen remains completely black, forcing me to terminate the application from the terminal.