Yeah I've had it running and streaming! Have run a few games this was - ARMA3, GTAV, South Park: Stick of Truth. All worked well.
Have also tried running the windows steam client in WINE and had a few more issues, but as ever YMMV.
The performance isn't quite as good (very close to windows perf levels), but quite a few anti-cheat systems will not work in Proton (even less so in WINE).
The performance isn't quite as good (very close to windows perf levels), but quite a few anti-cheat systems will not work in Proton (even less so in WINE).