protonscr

Killing Floor 3

protonopen appid 1430190Game compatibility - UnofficialXAudio2
ValveSoftware/Proton#9678 · opened 2026-04-17 by AlexandreSama · updated 2026-06-18 · 2 comments · github · game page · search this game
AAlexandreSama 2026-04-17 github

Compatibility Report

  • Name of the game with compatibility issues: Killing Floor 3
  • Steam AppID of the game: 1430190

System Information

I confirm:

  • [ ] 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.

steam-1430190.log

Symptoms

Background videos during shader loading and in the main menu do not load and display a white background.
You can see several mfplat errors in the log at each step, as well as raw AAC codec errors.

Reproduction

This can be reproduced every time the game is launched. Just get to the shader loading screen, and you'll already see the white screen.

DDarkArc 2026-04-17 github

I ran into that as well on AMD hardware. It seems to have resolved itself for me.

I think someone else I know ran into a similar issue on Windows. It seems to be a bug with the game that's much more prevelant on Linux.

DDarkArc 2026-06-18 github

Just wanted to note here that I'm having this issue on NVIDIA hardware now 5080 (my friend reported not having any issues on AMD hardware) and there's an odd detail in that only some of the menus are affected.

Image

vs

Image

This is what the upgrade screen (the white one) is supposed to look like: https://youtu.be/fVnVHHT6RB0?t=97

So it seems to be a missing codecs thing that maybe works for AMD (once the shader cache has the converted video present or using Proton GE which doesn't need the converted video cache?) but not for NVIDIA.

Proton versions