• Name of the game with compatibility issues: Clair Obscur: Expedition 33
• Steam AppID of the game: 1903340

System Information

• GPU: AMD Radeon RX 9060 XT (Navi 44)
• Video driver version: Mesa 26.0.5
• Kernel version: 6.19.14-300.fc44.x86_64
• Link to full system information report as Gist: https://gist.github.com/neidlosEnte7/10b2f3811e85750f71b1c28c413abe31
• Proton version: Tested with Proton Experimental and GE-Proton (latest)

Additional context:

• Distro: Fedora 44 (Cosmic Desktop)
• CPU: AMD Ryzen 5 7500F
• Audio: Realtek ALC897 onboard, analog stereo out
• PipeWire / WirePlumber: 1.6.4 / 1.6.4

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

No audio output from the game under Proton — menus, cutscenes, gameplay all silent. Every other Proton game on the same system works correctly. Steam Support directed me here.

The PipeWire stream from the game appears as active at 100% volume in pavucontrol, routed to the correct analog stereo sink, but the level meter stays completely flat. The game opens the audio stream but never sends any samples. speaker-test -c 2 -t wav works perfectly on the same sink.

PROTON_LOG (full file attached) shows no errors. FAudio initializes cleanly, mmdevapi.dll loads as builtin, AudioMixerRenderThread(1) spawns, no warnings beyond standard stubs:

```
trace:loaddll:build_module Loaded "...\xaudio2_9redist.dll" at ... native
trace:loaddll:build_module Loaded "...\xaudio2_9.dll" at ... builtin
trace:loaddll:build_module Loaded "...\mmdevapi.dll" at ... builtin
fixme:mmdevapi:control_RegisterAudioSessionNotification ... - stub
warn:threadname: Thread renamed to "FAudio_AudioClientThread"
warn:threadname: Thread renamed to "AudioMixerRenderThread(1)"
```

Strange detail: Audio worked exactly once, on the first launch after switching the sound card profile away from pro-audio to output:analog-stereo+input:analog-stereo. Every launch since then: silent. No configuration change between the working launch and the silent ones — suggests a possible race condition during FAudio/Wwise initialization rather than a static misconfiguration. The game has no in-game audio device selector or master volume option.

Reproduction

1. Install Clair Obscur: Expedition 33 on Fedora 44 with PipeWire 1.6.4 and a Realtek ALC897 onboard audio device, analog stereo out.
2. Launch via Proton Experimental or GE-Proton (latest).
3. Observe: game starts and runs, but produces no audio. pavucontrol shows the stream as active with a flat level meter.

Things tried (none resolved the issue)

• Compatdata wipe + Steam file integrity verification
• Switched between Proton Experimental and GE-Proton
• WINEDLLOVERRIDES="xaudio2_9=b,n" to force builtin FAudio over the bundled xaudio2_9redist.dll
• PULSE_LATENCY_MSEC=60
• SteamDeck=0
• PULSE_SINK="alsa_output.pci-0000_0d_00.6.analog-stereo"
• Set pulse.min.req, pulse.min.frag, pulse.min.quantum to 256/48000 in ~/.config/pipewire/pipewire-pulse.conf (per [#8626](https://github.com/ValveSoftware/Proton/issues/8626))
• Verified card profile is output:analog-stereo+input:analog-stereo, not pro-audio
• Verified default sink is correct in wpctl status

May be related to #8626 but symptoms differ — there the workarounds resolve the issue, here none of them apply.

Happy to provide additional logs or test patches if useful.

Screenshots

steam-1903340.log