Hello @robotheadache, please copy the contents of Steam Runtime Diagnostics from Steam (Steam -> Help -> Steam Runtime Diagnostics) and put it in a gist, then include a link to the gist in this issue report.
I'm having a similar issue using Proton Experimental [bleeding-edge]
https://gist.github.com/ProfessorChill/1f9dc46297e155adae7cefe6193c93df
Also having this issue on the latest closed technical test.
https://gist.github.com/unusualcrow/29279f225017fd9b4acb639d3c38bdd9
This has carried forward to AppID 4254230 (Marathon Server Slam 2026). Gist and Proton Logs attached below;
https://gitlab.com/-/snippets/5948862
proton experimentalx1 2025-04proton hotfixx1 2025-04DXVK_FILTER_DEVICE_NAME="llvmpipe"x1 2025-04PROTON_BATTLEYE_RUNTIME="/home/theo/.steam/steam/steamapps/common/Proton BattlEye Runtime/"x1 2025-04PROTON_LOG=1x1 2025-04
Compatibility Report
System Information
I confirm:
Symptoms
Game does not start. Steam shows app is running, but does not appear. Logs pasted into below gist indicate
warn: OpenXR: Unable to get required Vulkan instance extensions size 10698.743:0134:017c:err:vulkan:init_vulkan Failed to load Wine graphics driver supporting Vulkan. 10698.743:0134:017c:err:vulkan:init_vulkan Failed to load Wine graphics driver supporting Vulkan. info: Required Vulkan extension VK_KHR_surface not supportedhttps://gist.github.com/robotheadache/402ce6baf788d93e429bf0250fd449ef
Reproduction
Download Marathon.
Use Experimental [bleeding-edge] branch Proton.
Run with PROTON_LOG=1 PROTON_BATTLEYE_RUNTIME="/home/theo/.steam/steam/steamapps/common/Proton BattlEye Runtime/" %command%
Issue has been reproduced by the kind folks on the Marathon Discord on other platforms (Fedora Linux, Nvidia) and receives same error.
What I tried to fix this: