Alien: Fireteam Elite 2 (3448650)

Compatibility Report

• Name of the game with compatibility issues: Aliens: Fireteam Elite 2
• Steam AppID of the game: 3448650

System Information

• GPU: RX 7900 XTX
• Video driver version: Mesa 26.2.1-arch3.1
• Kernel version: 7.2.0-1-cachyos
• Link to full system information report as Gist: https://gist.github.com/sabinmarcu/c0f248670bb1be44deb5e52bb349394f
• Proton version: experimental / hotfix / steam default (also tried GE 11.5, cachyos both native and slr)

I confirm:

• that I haven't found an existing compatibility report for this game.

• that I have checked whether there are updates for my system available.

• additionally, I'm not the only one experiencing this; this thread on the Steam Discussions has reports from steam deck users, steam machine users, and unnamed linux distro users: https://steamcommunity.com/app/3448650/discussions/0/583932416070030533/

steam-3448650.log.gz

Symptoms

Cutscenes (intro cinematic and mid-mission cutscenes) play completely to the end, but the game never returns control to the player. The main game loop continues running (a “Saving Game” toast appears after the video finishes), but the cinematic state never exits.

The video itself decodes and plays correctly (H.264 High Profile 3840×2160 via GStreamer h264parse + avdec_h264).

I've tried digging into the logs myself, but it doesn't look like my limited knowledge can solve this.

Root cause from logs

GStreamer correctly generates an EOS event and Media Foundation creates an MEEndOfStream event, but Wine’s wg_transform explicitly ignores the EOS:

wg_stepper_event_cb: Pushing event eos event: ...
transform_sink_event_cb: transform 0x..., ignoring eos event: ...

Afterwards the Media Foundation session fails with:

warn:mfplat:session_events_callback_Invoke Failed to get event from ..., hr 0xc00d3e85

followed by MESessionClosed / shutdown.

This leaves the game’s cinematic state machine waiting forever for a completion signal that never arrives cleanly.

(The same class of “content finished but hand-off never happens” was also observed once with a loading screen under Proton Hotfix: the loading screen remains rendered, while the game is interactible in the background)

Reproduction

1. Launch the game on any recent Proton (Experimental, GE, proton-cachyos-native, etc.).
2. Watch the intro cutscene (or progress to the first mid-mission cutscene); optionally, Settings => Credits => Intro.
3. After the video ends, the game stays stuck in the cinematic; player control is never restored even though the rest of the engine is still running (eg. "Saving Game" notification).

Start with the reported wg_transform event path and reproduce the intro or mid-mission cutscene using the listed Proton versions. Inspect the Proton log around the EOS event and Media Foundation session errors; done means the cinematic exits and player control returns without the session becoming stuck.