Compatibility Report

• ACE COMBAT 8 (2288340)

System Information

• GPU: RTX 5080
• Video driver version: nvidia-open 615.71.09, ( also on 610.57.04 )
• Kernel version: Arch Linux, kernel 7.2.7-arch1-1
• Steam Information and Runtime Report in Gist
• Proton version: Experimental (experimental-11.0-20260924), GE-Proton10-34, GE-Proton11-7 - all of them behave the same

I confirm:

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

Latest logs with PROTON_LOG=1 VKD3D_CONFIG=breadcrumbs %command%

Symptoms

During the third loading screen ( The Prologue | Wings of Theve | ), whilst loading the whole system freezes for few seconds, (yet the audio from other apps are playing fine), after which the game becomes unresponsive and stops doing anything until 2 minutes when UE5 error-01 displays and shuts the game. After the freeze GPU hangs on 100% use for few seconds after which returns to normal behavior.
Also Journalctl reports Xid 109

Reproduction

Turn on the game, start a new campaign, skip or watch the first 2 cutscenes, after which - during the loading screen - the problem happens.