Falcon BMS VR not working with SteamVR

[SquadFM]

Compatibility Report

• Name of the game with compatibility issues: Falcon BMS (a mod for Falcon 4.0)
• Steam AppID of the game: 429530

System Information

• GPU: NVIDIA GeForce RTX 2080
• Driver/LLVM version: nVidia 525.89.02
• Kernel version: 6.1.12-1-MANJARO
• Link to full system information report as Gist
• Proton version: 7.0-6

I confirm:

• [x] that I haven't found an existing compatibility report for this game.
• [x] that I have checked whether there are updates for my system available.

Symptoms

Falcon BMS does not start in VR (with SteamVR). It works fine in normal 2D mode.

Reproduction

Falcon BMS is a mod for Falcon 4.0 (AppID 429530) and installs into the path /home/x/.local/share/Steam/steamapps/compatdata/429530/pfx/drive_c/Falcon BMS 4.37/. If needed, here are the Falcon BMS install instructions for Linux: https://github.com/SquadFM/Falcon-4-BMS

Falcon BMS starts in "normal" 2D mode with the command below and runs without issues: STEAM_COMPAT_DATA_PATH="/home/x/.local/share/Steam/steamapps/compatdata/429530/" STEAM_COMPAT_CLIENT_INSTALL_PATH="/home/x/.local/share/Steam/" "/home/x/.local/share/Steam/steamapps/common/Proton 7.0/proton" run "/home/x/.local/share/Steam/steamapps/compatdata/429530/pfx/drive_c/Falcon BMS 4.37/Bin/x64/Falcon BMS.exe"

However, Falcon BMS does not start in VR (Steam is open; tried with SteamVR running and not running before starting the game - neither works). Also, VR is enabled in the game in the config file /home/x/.local/share/Steam/steamapps/compatdata/429530/pfx/drive_c/Falcon BMS 4.37/User/Config/Falcon BMS.cfg where set g_nVRHMD is set to 1. It "just works" under Windows in SteamVR according to other users.

PROTON_LOG=1

The command below only creates the files Falcon BMS_d3d11.log and 'Falcon BMS_dxgi.log', however no file similar to $HOME/steam-$APPID.log.

Command to generate log files: PROTON_LOG=1 STEAM_COMPAT_DATA_PATH="/home/x/.local/share/Steam/steamapps/compatdata/429530/" STEAM_COMPAT_CLIENT_INSTALL_PATH="/home/x/.local/share/Steam/" "/home/x/.local/share/Steam/steamapps/common/Proton 7.0/proton" run "/home/x/.local/share/Steam/steamapps/compatdata/429530/pfx/drive_c/Falcon BMS 4.37/Bin/x64/Falcon BMS.exe"

Falcon BMS_d3d11.log

Falcon BMS_dxgi.log

Less important information:

• Falcon BMS requires the original Falcon 4.0 installation, which can be found under /home/x/.local/share/Steam/steamapps/common/Falcon 4.0/
• I tested if other games run in VR via command line. For example, Beat Saber starts and runs in VR with the following command just fine: STEAM_COMPAT_DATA_PATH="/home/x/.local/share/Steam/steamapps/compatdata/620980/" STEAM_COMPAT_CLIENT_INSTALL_PATH="/home/x/.local/share/Steam/" "/home/x/.local/share/Steam/steamapps/common/Proton 7.0/proton" run "/home/x/.local/share/Steam/steamapps/common/Beat Saber/Beat Saber.exe"

[kisak-valve]

Hello @SquadFM, we're using one issue report per unofficially supported game title, so I've gone ahead and transferred this issue report to https://github.com/ValveSoftware/Proton/issues/3991#issuecomment-1443831285.