Cannot run Rocket League with mod after setting PROTON_VERB=runinprefix

[emrebicer]

Does umu allow running 2 programs at the same time? I am trying to run Rocket League with the mod bakkesmod at the same time, the mod should run in the same environment to attach to Rocket League.

The umu wiki page suggests that I could set PROTON_VERB=runinprefix to run more than one game in the same wine prefix, I tried that but there is some weird behavior where it lets me run 2 programs simultaneously on a machine (even when it lets me do that there are some issues with actually making the mod work, mentioned at #168) however fails to do so on another setup. There is some discussion here with some logs provided that might be helpful.

Also running this mode alongside Rocket League is possible with wine, I read that people also manage to run it with Proton on Steam (but never tried it myself), so I want to ask if the idea of running 2 programs is supported and if so how should I do it.

[R1kaB3rN]

Running 2+ programs at the same time is supported via the proton script's runinprefix verb as specified in the wiki. Up until now, I have observed that users of GE-Proton have had success setting PROTON_VERB=runinprefix, so this issue makes it the 1st reported case where there are problems with that verb. Other than that, umu-launcher makes no additional effort to handle this use case.

[R1kaB3rN]

This is technically not a bug with the launcher, but rather a possible constraint with an upstream component or an OS issue. For now, I'm going to go ahead and rename this issue as something local to this game until more users across various setups/games run into this problem.