When launching Arc Raiders on Arch Linux with Openbox, Proton crashes with an assertion failure in the Vulkan loader. The crash occurs consistently on the GTX 1660 SUPER GPU while using default Proton settings.

Error

assertion failed!
/winevulkan/loaderchunks.c line 3547
expression: "!status && "kvCreateSwapchainKHR""

Proton versions tested

• Proton 10.0‑3 (stable)
• Proton Experimental
• Proton Hotfix

Steps to reproduce

• Log into Openbox on Arch Linux.
• Launch Steam.
• Start Arc Raiders on the GTX 1660 SUPER.
• Game attempts to initialize Vulkan and crashes immediately with the assertion above.

Expected vs actual

Expected behavior

The game should launch and run normally using Vulkan on the GTX 1660 SUPER. (Tested and works on Windows 11 on same driver)

Actual behavior

The game crashes during Vulkan initialization with an assertion failure in loaderchunks.c.

System info

• Distro: Endeavouros
• Kernel: 6.18.6-arch1-1
• GPU: NVIDIA GTX 1660 SUPER
• Driver version: 590.48.01 using modules nouveau, nvidia_drm and nvidia
• CPU: AMD Ryzen 9 7900X
• Display server: X11
• Desktop environment: Openbox
• Multi-GPU setup: GTX 1660 SUPER (seat1) and RTX 3060 (seat0 and having no issues)
• Steam Runtime: Enabled
• Steam Play / Proton: Default settings

Additional information

• The issue appears to be specific to Vulkan initialization on the 1660 SUPER.
• Other GPUs may not reproduce this crash in the same configuration.
• Tried on multiple Proton versions (stable, experimental, hotfix) with same results.