protonscr

Assassin's Creed Shadows: deterministic VK_ERROR_DEVICE_LOST at Amagasaki Castle on RTX 4080 / NVIDIA 610.43.03

vkd3dclosed
HansKristian-Work/vkd3d-proton#3196 · opened 2026-08-05 by VIPBotsMark · updated 2026-08-05 · 2 comments · github
VVIPBotsMark 2026-08-05 github

System:

GPU

NVIDIA GeForce RTX 4080

Driver

610.43.03
Open Kernel Module

Kernel

Linux CachyOS 7.1.5-1

Display

Wayland (KDE Plasma)

Reproduction

Launch Assassin's Creed Shadows.
Load into the Amagasaki Castle area.
Approach the fortress.
Rotate the camera toward a specific facade of the castle.
The game freezes immediately.

Notes:

It is possible to approach the castle from other directions.
Looking at the tower does not trigger the issue.
Only one specific camera angle causes the failure.
Reproduces 100% of the time.

Expected:

Game continues rendering normally.

Actual:

Image freezes.
Audio continues playing.
Keyboard input no longer affects the game.
Proton log reports:

vkd3d_wait_for_gpu_timeline_semaphore

Device is lost

VK_ERROR_DEVICE_LOST

Things already tested:

Proton Experimental
GE-Proton 11.3
Ray Tracing ON
Ray Tracing OFF
DLSS Quality
Frame Generation OFF
Gamescope
VKD3D breadcrumbs
VKD3D_DISABLE_EXTENSIONS
Verified NVIDIA installation
No kernel Xid
No GPU reset

No configuration changes the behavior.

Kernel log

No Xid or GPU fault is produced.

dmesg contains no Xid

Here's a screenshot just after the freeze:
Image

Proton log:

steam-12071304837287903232.log

SSaancreed 2026-08-05 github

I got somewhat tired of waiting for this to be investigated and resolved, so I did some absolutely stupid shotgun debugging: https://github.com/HansKristian-Work/vkd3d-proton/compare/master...Saancreed:ac-shadows

This makes the game stable on my system, but I'm not sure if it's just pure luck, or the issue really is somewhere in there. Feel free to give this a try; rebuild vkd3d-proton with changes I linked above then attempt to reproduce the hang, maybe it will fix them for you as well.

VVIPBotsMark 2026-08-05 github

I got somewhat tired of waiting for this to be investigated and resolved, so I did some absolutely stupid shotgun debugging: master...Saancreed:ac-shadows

This makes the game stable on my system, but I'm not sure if it's just pure luck, or the issue really is somewhere in there. Feel free to give this a try; rebuild vkd3d-proton with changes I linked above then attempt to reproduce the hang, maybe it will fix them for you as well.

Solves it for me too. I'll try playing more to see if I find any more crashes, but so far it's good. Thanks!

Proton versions

Launch options