Hi @x4mers,

Unfortunately, I already have amdgpu enabled, so that can't be the reason. I can share my vulkaninfo output if it helps.

Hello, from the log and the steam system information, I'm quite confident you've run into an issue I, and some others have experienced as well https://github.com/ValveSoftware/Proton/issues/3573
You have a very old lcd for the radv vulkan driver lying around, version 1.0.3. When using proton, it apparently picks up this lcd version, and DXVK then fails because it requires at least version 1.1.

Try deleting /etc/vulkan/icd.d/radeon_icd.i686.json, /etc/vulkan/icd.d/radeon_icd.x86_64.json and /etc/vulkan/icd.d/radeon_icd.json then restart steam.
See if those lcd's stop showing up in the Steam System Information window. If they don't, and if you're still using RadV, which it looks like from the Proton Log, then the games should launch

Well... that works! Thanks!

But dpkg's behavior was quite odd:

$ dpkg -S /etc/vulkan/icd.d/radeon_icd\*
libgl1-mesa-dri:i386, libgl1-mesa-dri:amd64: /etc/vulkan/icd.d/radeon_icd.json
libgl1-mesa-dri:amd64: /etc/vulkan/icd.d/radeon_icd.x86_64.json
libgl1-mesa-dri:i386: /etc/vulkan/icd.d/radeon_icd.i686.json

I then force reinstalled libgl1-mesa-dri packages and now:

$ dpkg -S /etc/vulkan/icd.d/radeon_icd\*
dpkg-query: no path found matching pattern /etc/vulkan/icd.d/radeon_icd*

Basically, after reinstalling libgl1-mesa-dri when those files were no longer there dpkg no longer recognizes those files! I confirmed this by noticing that intel_icd was still recognized even after reinstalling, so I deleted the icd files, reinstalled packages and, again, dpkg no longer recognized them.
I should report this as a bug to Mesa...