Steam

Steam

Launch options

1. Right-click the game → Properties.
2. Under Launch options:

linuwux %command%

Requires ~/.local/bin on PATH. If Steam was already running when you fixed PATH, restart it once — or use ~/.local/bin/linuwux %command% until you do.

3. Compatibility tool: GE-Proton or CachyOS Proton (not stock Valve Proton).

Non-Steam games

Same launch option string. Add the game → set compatibility tool → set launch options as above.

With MangoHud

linuwux mangohud %command%

Or use a Steam MangoHud toggle/script if you already have one — keep linuwux outside wrapping mangohud in the wrong order (Common mistakes).

Debug

LINUWUX_DEBUG=1 linuwux %command%

Gamescope

Steam + gamescope is the better-tested path. For third-party launchers see Gamescope.