Hello @jvschiavo, DXVK bundled with Proton currently requires that the video driver provides Vulkan 1.3 and a handful of other things to start up (https://github.com/doitsujin/dxvk/wiki/Driver-support). The video driver for your hardware generation provides Vulkan 1.2. You might be able to get the video driver to pretend it supports Vulkan 1.3, but if any of the missing functionality is used with the game, then it'll fall over.
While PROTON_USE_WINED3D can be useful for troubleshooting, that render path is not considered supported. Sorry, but your GPU isn't supportable in general with Proton.
proton experimentalx1 2025-08proton hotfixx1 2025-08PROTON_USE_WINED3Dx1 2025-08PROTON_USE_WINED3D=1x1 2025-08PROTON_USE_WINED3D=1`x1 2025-08PROTON_USE_WINED3D=1 %command%x1 2025-08
Compatibility Report
Soul Brave
2980240
System Information
Intel HD Graphics 4400
Mesa 25.0.7-2
6.12.38+deb13-amd64
I can post it later if it is really necessary
I've tried all of them:
~ Proton Hotfix
~ Proton Experimental
~ 10.0-2 (beta)
~ 9.0-4
~ 8.0-5
~ 7.0-6
~ 6.3-8
~ 5.13-6
~ 5.0-10
~ 4.11-13
~ 4.2-9
~ 3.16-9
~ 3.7-8
I confirm:
Symptoms
The game doesn't launch properly, it gives a fatal error.
With the latest stable Proton release, 9.0-4, no start parameters:

(same result for all recent Proton versions)
Since I have limited Vulkan support, I usually have to add the
PROTON_USE_WINED3D=1parameter.With the latest stable Proton release, 9.0-4, with

PROTON_USE_WINED3D=1 %command%as the start parameter:(same result for all recent Proton versions)
Needless to say, older versions of Proton had different behaviors and wouldn't go as far.
Reproduction
2a) Launch the game
2b) Add the
PROTON_USE_WINED3D=1 %command%parameter and launch the gameI can add a proton log later if it is really necessary.