If I switch to use the proton installed from flatpak (Proton 5.13-2 (community build 1606320612)), I get the "$HOME/steam-$APPID.log" file in ".var/app/com.valvesoftware.Steam/".
[.var/app/com.valvesoftware.Steam/steam-873940.log]
======================
Proton: 1606320612 proton_flatpak-5.13-2
SteamGameId: 873940
Command: ['/home/yzq50/.local/share/Steam/steamapps/common/Crying Suns/cs.exe']
Options: {'forcelgadd'}
======================
I suppose my proton is broken. It seems that all games can't work with proton.
proton 5.13-2x1 2020-12
Compatibility Report
System Information
I confirm:
Symptoms
The game "RiME" works fine with proton, but "Crying Suns" doesn't.
The game just can't be started. Clicking the buttom "Start the game" is useless.
There is no "$HOME/steam-$APPID.log" file in ".var/app/com.valvesoftware.Steam/
".
I use the steam client installed from flatpak.
Reproduction