Frequently asked questions (FAQ)

Frequently asked questions (FAQ)

How do I run more than one game in the same wine prefix?

By default, umu-launcher sets the Proton verb waitforexitandrun when launching games, which will cause the current process to wait until an active wineserver process has exited. To run more than one game in the same prefix, you must disable this behavior for subsequent games by setting either PROTON_VERB=runinprefix or PROTON_VERB=run.

Also, it's important that the Proton or wine configuration for each nth game is equivalent except for the PROTON_VERB environment variable. Otherwise, unexpected behavior may occur. For example:

GAMEID=0 umu-run foo

GAMEID=0 PROTON_VERB=runinprefix umu-run foo

However, launching the second game with fsync disabled would be invalid:

GAMEID=0 umu-run foo

GAMEID=0 PROTON_VERB=runinprefix PROTON_NO_FSYNC=1 umu-run foo

How do I use a Proton that is installed in a system path?

umu-launcher only searches $HOME/.local/share/Steam/compatibilitytools.d for UMU-Proton or GE-Proton builds when configured to use the latest Proton build. See the documentation for an example on how to do this.

Proton is compiled and is designed to execute inside in a runtime environment, and the reason umu-launcher does not search system paths is because compatibility tools there may not all be compiled against the Steam Linux Runtime. Since the goal of this project is for users to run their games through Proton just as it were launched from Steam, using Proton builds built outside the SLR would be against the project's goals.

To use a Proton build installed in a system path, explicitly set the path in PROTONPATH. For example:

GAMEID=0 PROTONPATH=/usr/share/steam/compatibilitytools.d/proton-ge-custom-bin umu-run foo