protonscr

Assassin's Creed Syndicate can't launch

dxvkclosed can't reproduce
doitsujin/dxvk#5428 · opened 2026-01-04 by JND94 · updated 2026-02-10 · 9 comments · github
JJND94 2026-01-04 github

Something between DXVK: v2.7.1-227-gb128f9f44b60bb2 (this works) and DXVK: v2.7.1-355-gb650faef2604bbb (this doesn't work) broke the game with a DirectX 11 not supported error window

  • GPU: RX6600
  • Driver: Mesa 25.3.3
  • Wine version: Proton-EM 10-33

steam-0.log

Ddoitsujin maintainer 2026-01-04 github

What on earth is Proton-EM?

I'm assuming that there's something wrong with winevulkan in that Proton build because it seems to not expose some features to expose FL11_0+:

info:  D3D11InternalCreateDevice: Maximum supported feature level: D3D_FEATURE_LEVEL_10_1
err:   D3D11InternalCreateDevice: Minimum required feature level D3D_FEATURE_LEVEL_11_0 not supported

Which is obviously nonsense, both the GPU and Mesa version are more than enough to fully expose FL12_1.

Equally obviously, this problem doesn't occur on Proton-Experimental or even plain wine on my 6900XT, regardless of Mesa versions.

JJND94 2026-01-04 github

It's https://github.com/Etaash-mathamsetty/Proton
I'm sorry I assumed it was a dxvk's issue since copying dxvk libs from previous proton-em build worked and I only had issues with this game so far

Ddoitsujin maintainer 2026-01-04 github

FWIW the code to determine the maximum supported feature level hasn't changed between the working and supposedly non-working commits at all, so that's... strange.

Where's your DXVK build from exactly? Asking because the logs mention GCC 10.3 being used, which is somewhat ancient. I can't rule out some sort of UB on our end either that only surfaces on old toolchains, but right now I have absolutely nothing to go by.

JJND94 2026-01-04 github

steam-0.log
This log is the game working with Proton-EM 10-33 after copying DXVK's libs from Proton-EM 10-32 (literally replacing the libs in ../proton-EM-10.0-33/files/lib/wine/dxvk/)

For more context, it's umu-launcher and Ubisoft Connect

BBananaWorks07 2026-01-04 github

For what it's worth I can't reproduce either

Nnaowaf 2026-01-06 github

i have similiar issue on windows 11, i'm using intel arc a770. The game running normal without dxvk

KK0bin maintainer 2026-01-06 github

@naowaf That's almost certainly simply because of either Windows (loading the wrong DLL) or Intels Windows Vulkan driver.

Nnaowaf 2026-01-07 github

@naowaf That's almost certainly simply because of either Windows (loading the wrong DLL) or Intels Windows Vulkan driver.

i mean the dxvk version 2.7.1 doesn't work i have to rollback to version 2.6 in myy windows 11

JJND94 2026-02-10 github

I'm sorry I didn't remember game was modded 🤦

Proton versions