Same issue on Ubuntu 22.04 with a RTX 3060. Also, here is a video that shows exactly what happens : https://www.reddit.com/r/linux_gaming/comments/1jfdzc9/ac_shadows_cant_access_main_menu_fedora_41_nvidia/

Yeah, I have the same issue on Arch Linux with RTX 4090, also blocked by denuvo after switching proton version too many times in 24h.

The freeze might be connected to the well known Xid109 CTX SWITCH TIMEOUT problem:

I get the same error with Assassin’s Creed Shadows :
Game crashes during the after introduction loading screen with
Xid (PCI:0000:2d:00): 109, pid='', name=, Ch 00000014, errorString CTX SWITCH > TIMEOUT, Info 0x7c011
On 560.35.03 and 570.124.04
Lutris with Proton-GE 9.26, vkd3d 2.14.1, dxvk 2.6

I also have it in the logs (3080 12G, 6.13.7-arch1-1, 570.124.04, Proton Experimental):

NVRM: Xid (PCI:0000:08:00): 109, pid=437293, name=ACShadows.exe, Ch 00000034, errorString CTX SWITCH TIMEOUT, Info 0x2ec037

On a side note, @benmoussatMouad, you might want to rename the issue to Assassin’s Creed Shadows (3159330), in line with all specific game related issues here.

Known driver bug.

I made a Pyroveil configuration here: https://github.com/HansKristian-Work/pyroveil/tree/master/hacks/ac-shadows-nvidia-570-stable

See the FF VII Rebirth issue for how people got it to work if the README doesn't work.

Another option is to install the latest NVIDIA Vulkan beta driver 570.123.06 which seems to have a fix for it. At least I got past those hangs, but didn't play the game for extended periods to verify or anything. Note that this is not the normal beta driver. The Vulkan beta drivers have different numbering: https://developer.nvidia.com/vulkan-driver (Vulkan Developer Beta Driver Release Updates).

I made a Pyroveil configuration here: https://github.com/HansKristian-Work/pyroveil/tree/master/hacks/ac-shadows-nvidia-570-stable

Seams to work well. Therefore I had to disable in-game DLSS related options to prevent more craches during cinematics.

Edit:
It's not the DLSS option that craches the game but the VRAM usage.
I have no problem with medium graphics (5500Mo/8000Mo) settings but it crashes when I set the game on high preset (6500Mo/8000Mo)

Replying to https://github.com/ValveSoftware/Proton/issues/8543#issuecomment-2742509737

Can confirm that this works on EndeavourOS, kernel version 6.12.19-1-lts with an RTX 2080, Nvidia Driver Version 570.124.04 running in Proton Experimental.

Thanks to @HansKristian-Work !

For anyone checking about AMD graphics, it's working great on 7000 series cards. Stock config in Steam and no issues. Ubuntu 24.04 with 6.11 HWE kernel.

Hi, I am using a 9070XT and the game runs very well, except for a pretty significant visual bug. The ground textures look like tiles. Similar to a grid with big black lines.

This looks like a pretty common issue with the gpu, and also I tried multiple proton versions. All of them are like this. I also tried it on my steamdeck and it works fine there.

I am using a ryzen 5800X with the latest bazzite os release (latest mesa and linux version).

For anyone checking about AMD graphics, it's working great on 7000 series cards. Stock config in Steam and no issues. Ubuntu 24.04 with 6.11 HWE kernel.

Great thanks for the info bud that's a super helpful contribution to a thread about the issues the game is currently having with nvidia drivers. you're an absolute legend

For anyone checking about AMD graphics, it's working great on 7000 series cards. Stock config in Steam and no issues. Ubuntu 24.04 with 6.11 HWE kernel.

Great thanks for the info bud that's a super helpful contribution to a thread about the issues the game is currently having with nvidia drivers. you're an absolute legend

I check these threads before buying games, as I am sure others do also. Therefore it helps prospective buyers. Please keep your responses polite and helpful.

Is the Pyroveil patch working for 550, too?

CPU: AMD 5800
GPU: Nvidia 3080
Kernel: 6.13
System: manjaro

Pyroveil and nvidia beta drivers fix problem with crash in menu

but i have stuttering/freezes every few seconds... its unplayable that way...
even ubisoft logo stuttering...

Thanks for the reports everyone. A fix for the GPU hang in the main menu with NVIDIA drivers will release in the next r570 driver.

OS: Ubuntu 24.04.2 LTS x86_64
Host: 83GS LOQ 15IAX9
Kernel: 6.11.0-21-generic
Resolution: 1920x1080
CPU: 12th Gen Intel i5-12450HX (12) @ 4.400GHz
GPU: NVIDIA GeForce RTX 3050 6GB Laptop GPU
Memory: 5669MiB / 64079MiB
NVidia driver version 570.124.04
The game freezes right before the menu. Any idea which driver version is the right one? I tried to install 570.123.06 but haven't been able to make it work properly. The current version i have is higher but it may not have the fix mentioned?

Sadly pyroveil doesn't fix the issues for me either. I am running the game on a bazzite-deck-nvidia:testing branch on a Lenovo Legion 7 on RTX 3070 with nvidia driver 570.133.07. The game has lots of freezing, stuttering and artifacts

Please see the video below.
https://youtube.com/shorts/Dut3b14MBmE?si=rUIQXF6CeS4mBqI8

Any pointers in resolving ?

It used to run perfectly fine for me, thanks to Pyroveil, until today. But after the recent game update it is back to freezing as soon as intro videos stop and 3d character models appear. Could it be that the Pyroveil config needs an update for game version 1.0.2?

I can confirm it's broken again in 1.0.2 of the game.

Edit : I tried disabling the pyroveil hack but no success either.
Edit2 : I tried installing beta driver 570.123.07 (latest one) but it broke my system and I had to revert back to vanilla driver (No luck here I may retry tonight)

Yes this is broken again on version 1.0.2

Issue solved.
https://github.com/HansKristian-Work/pyroveil/issues/9

Perhaps the pyroveil config needs to be updated

Literally my last posting.

Hey,

after starting a new game I immediately get a game crash.

I have to use pyroveil since I am using a Nvidia 3080 card with driver 570.133.07.

pyroveil is at 59370a3ad7688e044d917e10f006f90702885925 (for AC 1.0.2 patch)

Game startup command: mangohud PROTON_LOG=1 PYROVEIL=1 PYROVEIL_CONFIG=/home/paco/programs/pyroveil/hacks/ac-shadows-nvidia-570-stable/pyroveil.json %command%

Log:
steam-3159330.log

What else is wierd:
Sometimes I can only get to the main menu if I delete the dlc_10 folder (from the games installation directory), else I get stuck at "memory something something at 93%" and then get a game crash aswell.
Sometimes it works with the folder in place tho.

However, I am for now always receiving a game crash when starting a new game.

Looking at protondb it seems nobody else has this problem.

Kernel: Linux 6.14.2-arch1-1
OS: EndeavourOS x86_64
DE: KDE Plasma 6.3.4
WM: KWin (X11)
CPU: 12th Gen Intel(R) Core(TM) i7-12700K (20) @ 5.00 GHz

Replying to https://github.com/ValveSoftware/Proton/issues/8543#issuecomment-2804995375

Have you tried clearing vkd3d-proton.cache and vkd3d-proton.cache.write again? I've read that others have had luck clearing the entire Steam cache (bit extreme).

I'm on Flatpak and latest pyrovile but my driver is older and have not had any issues other than horse jumping around in the spot while area loads, but I think that's a game bug.

Yes I tried that aswell. Also in the Documents dir (prefix) I've deleted the ACShadows folder and in the Uplay directory I've deleted the savegames folders. (As per instruction given here: https://steamcommunity.com/app/3159330/discussions/1/612032512885029086/?l=english&ctp=2)

Some comments say this is due to framegen and DLSS. But right now I dont get to see the main menu anymore, so I cant even go to the graphics options to change any thing. And I didnt figure out what line I need to change or add in the ACShadows.ini confuguration file to switch that setting.

I can confirm that the title screen hang observed with an Nvidia card (I was previously using driver 570.133.07) has been fixed with today's released beta version 575.51.02.

I can confirm that the title screen hang observed with an Nvidia card (I was previously using driver 570.133.07) has been fixed with today's released beta version 575.51.02.

I confirm too. It fixed and runs great without pyroveil now \:D/

For me it still crashes. :(
I've updated to nvidia beta 575.51.02 drivers and restarted my pc.

run command: mangohud PROTON_LOG=1 WINEDLLOVERRIDES=libglesv2.dll=d DXVK_FRAME_RATE=60 %command%

steam-3159330 (1).zip
steam-3159330_after_clear_protoncachefiles.zip
steam-3159330_after_clear_settings_and_savegames.zip
steam-3159330_after_patch.zip

Symptoms:
After the game verifies that I am online, I am getting a message about "Memory add-ons (...) 94%" (sometimes 93, or 96%) and then the game crashes.
I've tried other tips such as running in windowed mode (ALT+ENTER) and ALT-Tabbing when the check occurs, but I couldnt make it.

Replying to https://github.com/ValveSoftware/Proton/issues/8543#issuecomment-2815260700

Sorry, silly question, did you blow away the cache?

The only cache files I cleared were vkd3d-proton.cache in the game installation folder.

Hi, I am using a 9070XT and the game runs very well, except for a pretty significant visual bug. The ground textures look like tiles. Similar to a grid with big black lines.

This looks like a pretty common issue with the gpu, and also I tried multiple proton versions. All of them are like this. I also tried it on my steamdeck and it works fine there.

I am using a ryzen 5800X with the latest bazzite os release (latest mesa and linux version).

The problem is unfortunately still there and no fix has been found yet

mesa 1:25.0.4-1

Logs-lutris.txt

The game works fine but I still encounter random craches (cf full logs).

Bellow the capture of the crach:

11339.403:0660:07a4:err:vkd3d-proton:d3d12_command_queue_execute: Failed to submit queue(s), vr -4.
11339.403:0660:07a4:err:vkd3d-proton:dxgi_vk_swap_chain_submit_blit: Failed to submit swapchain blit, vr -4.
11339.403:0660:07a4:err:vkd3d-proton:dxgi_vk_swap_chain_present_signal_blit_semaphore: Failed to submit present discard, vr = -4.
11339.403:0660:07a4:err:vkd3d-proton:d3d12_command_queue_execute: Failed to submit queue(s), vr -4.
11339.403:0660:07a4:err:vkd3d-proton:d3d12_command_queue_execute: Failed to submit queue(s), vr -4.
11339.403:0660:07a4:err:vkd3d-proton:d3d12_command_queue_execute: Failed to submit queue(s), vr -4.
11339.403:0660:07a4:err:vkd3d-proton:dxgi_vk_swap_chain_submit_blit: Failed to submit swapchain blit, vr -4.
11339.403:0660:07a4:err:vkd3d-proton:dxgi_vk_swap_chain_present_signal_blit_semaphore: Failed to submit present discard, vr = -4.```

Here relevent system information :

System:
  Kernel: 6.8.0-60-generic arch: x86_64 bits: 64 compiler: gcc v: 13.3.0 clocksource: tsc
  Desktop: Cinnamon v: 6.4.8 tk: GTK v: 3.24.41 wm: Muffin v: 6.4.1 vt: 7 dm: LightDM v: 1.30.0
    Distro: Linux Mint 22.1 Xia base: Ubuntu 24.04 noble

CPU:
  Info: 6-core model: AMD Ryzen 5 3600 bits: 64 type: MT MCP smt: enabled arch: Zen 2 rev: 0 cache:
    L1: 384 KiB L2: 3 MiB L3: 32 MiB
  Speed (MHz): avg: 2200 high: 2201 min/max: 2200/4208 boost: enabled cores: 1: 2200 2: 2201
    3: 2200 4: 2201 5: 2200 6: 2200 7: 2199 8: 2201 9: 2200 10: 2200 11: 2200 12: 2200
    bogomips: 86402
  Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm
Graphics:
  Device-1: NVIDIA TU104 [GeForce RTX 2080] vendor: Micro-Star MSI driver: nvidia v: 570.153.02
    arch: Turing pcie: speed: 5 GT/s lanes: 16 ports: active: none off: DP-1,DP-3,HDMI-A-1
    empty: DP-2 bus-ID: 2d:00.0 chip-ID: 10de:1e82 class-ID: 0300
  API: EGL v: 1.5 hw: drv: nvidia platforms: device: 0 drv: nvidia device: 2 drv: swrast gbm:
    drv: nvidia surfaceless: drv: nvidia x11: drv: nvidia inactive: wayland,device-1
  API: OpenGL v: 4.6.0 compat-v: 4.5 vendor: nvidia mesa v: 570.153.02 glx-v: 1.4
    direct-render: yes renderer: NVIDIA GeForce RTX 2080/PCIe/SSE2
  API: Vulkan v: 1.3.275 layers: 9 surfaces: xcb,xlib device: 0 type: discrete-gpu driver: N/A
    device-ID: 10de:1e82 device: 1 type: cpu driver: N/A device-ID: 10005:0000

  Memory: total: 32 GiB available: 31.26 GiB used: 3.02 GiB (9.7%)
  Processes: 356 Power: uptime: 3h 14m states: freeze,mem,disk suspend: deep wakeups: 0
    hibernate: platform Init: systemd v: 255 target: graphical (5) default: graphical
  Compilers: clang: 14 alt: 18 gcc: 13.3.0 alt: 6/7/9/10/11/12 Client: Cinnamon v: 6.4.8
    inxi: 3.3.34

NVIDIA-SMI 570.153.02             Driver Version: 570.153.02     CUDA Version: 12.8 
Proton-GE 9.27 (wanted to try with Proton-GE 10.3 but uplay doesn't launch)

I made some more tests with the in-game benchmark , it looks like DXVK NVAPI version+ Graphic options have a role to play :

DXVK NVAPI 0.9.0 + Graphics Low --> Crash on first few frames
DXVK NVAPI 0.8.0 + Graphics Low --> PASS (55 FPS 4500MB/7800MB VRAM)
DXVK NVAPI 0.8.0 + Graphics Medium --> (PASS 50 FPS 4800MB/7800MB VRAM)
DXVK NVAPI 0.8.0 + Graphics High --> (PASS 45 FPS 5200MB/7800MB VRAM)
DXVK NVAPI 0.8.0 + Graphics Very High --> Crash on first few frames

Under NVAPI 0.8.0, the game still crashes randomly in cut scenes or when quitting the inventory, but less often compared when running with NVAPI 0.9.0

Replying to https://github.com/ValveSoftware/Proton/issues/8543#issuecomment-3300442211

I'm seeing the same issue as in this report. I also saw this line in the PROTON_LOG. Having this issue since applying the 1.1.1 patch

wine: Unhandled page fault on read access to 0000000000000000 at address 0000000141B10197 (thread 04e0), starting debugger...

There are also several reports on protondb describing the problem with the 1.1.1 patch https://www.protondb.com/app/3159330

This is crashing for me on Nvidia driver 580.82.07,

PYROVEIL=1 PYROVEIL_CONFIG=/home/dylan/pyroveil/hacks/ac-shadows-nvidia-570-stable/pyroveil.json %command%

does not work

I saw some indicating at https://www.protondb.com/app/3159330 to check game files for integrity or copying files over from a Windows installation. Checking for integrity detected corrupt files and redownloaded them. Now the crash is gone. On the very first launch after the integrity check I accidentally started with SW rendering which required incredible amounts of RAM but made it until the title screen.

Replying to https://github.com/ValveSoftware/Proton/issues/8543#issuecomment-3358089161

So, we have to copying the save game from windows to `"$HOME/.local/share/Steam/steamapps/compatdata/3159330/pfx/drive_c/Program Files (x86)/Ubisoft/Ubisoft Game Launcher/savegames/"

Or any another method for run this game without dual booting?

Replying to https://github.com/ValveSoftware/Proton/issues/8543#issuecomment-3404694298

This game runs perfectly under Ubisoft launcher in Lutris. You won't even have to move the game files. My game files are on an NTFS partition and I use the import game functionality of Ubisoft Game Launcher.

Replying to https://github.com/ValveSoftware/Proton/issues/8543#issuecomment-3404764732

Unfortunately i bought this game from steam not from unplay store

Replying to https://github.com/ValveSoftware/Proton/issues/8543#issuecomment-3404902998

My understanding of the handover between Steam and Ubisoft is through a Ubisoft account. You would have had to create one when you first installed the game and associate it with Steam. This account can then be used for accessing all your Ubisoft titles directly from Ubisoft launcher. You can check the account details in the linked account section of Steam. You would also have received an email from Ubisoft when you registered the game purchase.

The issue with the game silently shutting down before menu should be fixed on Proton Bleeding Edge. Thank you for the reports.

The issue with the game silently shutting down before menu should be fixed on Proton Bleeding Edge. Thank you for the reports.

EDIT:
It worked as a charm!!

Thank you @Blisto91

I was able to play the game in March/April. Now I am facing an unhandled exception issue:

Unhandled exception: page fault on read access to 0x0000000000000018 in 64-bit code (0x0000014254ad55).

I tried with all versions of Proton, including Experimental (Bleeding Edge). My system settings are the following:
OS: Manjaro Linux
KERNEL: 6.17.6-1-MANJARO
CPU: AMD Ryzen 7 5800X 8-Core
GPU: AMD Radeon RX 9070 XT (radeonsi, gfx1201, LLVM 21.1.4, DRM 3.64, 6.17.6-1-MANJARO)
GPU DRIVER: 4.6 Mesa 25.2.6-arch1.1
RAM: 64 GB

I uploaded the full log at the link steam-3159330.log.

This issue is still occurring for me on Experimental (Bleeding Edge)

This issue is still occurring for me on Experimental (Bleeding Edge)

PROTON_LOG=1 %command% as the launch command on the game in steam, game, proprieties, upload the log from the home folder to here with core information about the system you have aswell like distro, kernel, drivers, GPU.

And of course what problem is still occuring for you.

The game locks up just before loading the main menu.

I have uploaded the full log (50 MB) here.

======================
Proton: 1745943995 experimental-bleeding-edge-9.0-191846-20250429-p965305-wfc8c710-d27b71a-v4ec9ec
SteamGameId: 3159330
Command: ["/home/owen/.local/share/Steam/steamapps/common/Assassin's Creed Shadows/ACShadows.exe", '-uplay_steam_mode']
Options: {'forcelgadd'}
depot: 3.0.20250929.168600
pressure-vessel: 0.20250926.0 scout
scripts: 0.20250926.0
sniper: 3.0.20250929.168600 sniper 3.0.20250929.168600
Kernel: Linux 6.8.0-86-generic [#87](/issue/ValveSoftware/Proton/87)-Ubuntu SMP PREEMPT_DYNAMIC Mon Sep 22 18:03:36 UTC 2025 x86_64
Language: LC_ALL None, LC_MESSAGES None, LC_CTYPE None
Effective WINEDEBUG: +timestamp,+pid,+tid,+seh,+unwind,+threadname,+debugstr,+loaddll,+mscoree
======================

I have the same issue as above. Used to run fine, now it doesn't start up (ubi launcher never pops and the game doesn't start up).

I have the same issue as above. Used to run fine, now it doesn't start up (ubi launcher never pops and the game doesn't start up).

i had the same issue and installing lib32-vulkan-radeon fixed it for me.

Are people still experiencing issues with this game? I've been playing this game without any issues on latest proton without needing Pyroveil since the release of patch 1.0.4. Now I'm running 1.1.8 with manual jumping and everything works great. Happy to walk through with anyone still struggling.

I have the same issue as above. Used to run fine, now it doesn't start up (ubi launcher never pops and the game doesn't start up).

I suddenly started having this issue after updating my GPU drivers to the 595 beta (nvidia), but just deleting the entire proton prefix in compatdata fixed it for me.

Does the issue still persists with the RTX 3080?

Compatibility Report

• Name of the game with compatibility issues: Assasin's Creed Shadows
• Steam AppID of the game: 3159330

System Information

• GPU: AMD AMD Radeon 8060S Graphics
• Video driver version: 4.6 (Compatibility Profile) Mesa 26.0.5
• Kernel version: 6.19.14-ogc5.1.fc44.x86_64
• Link to full system information report as Gist:
• Proton version: 1780064122 experimental-11.0-20260529

steam-3159330.log

I confirm:

• [x] that I haven't found an existing compatibility report for this game.
• [x] that I have checked whether there are updates for my system available.

Symptoms

When I select "Quit to Desktop" from the game, the game exists but Steam doesn't detect that and still considers the game running (the launch button shows as "Stop" rather than "Play"

Reproduction

Go into game page in Library, press "Play"
Wait for game launch, go into main menu
Select "Quit to Desktop", wait for game to quit.

Observe that Steam library page still shows the button as "Stop" (blue) and game time is still counting.

Assassin's Creed Shadows (3159330) hangs on RTX 5080 / NVIDIA open 610.43.02, stuck in vkd3d waits

Any update on this? I haven't been able to play in like a month. Happens on 595 drivers for me too, hoped the 610 would fix it but didn't. The crashes happen at the same spots every time.

A workaround I have been using for the exact above issue is to manually make a debug build of vkd3d-proton, replace the proton d3d12 dlls with these, and set VKD3D_CONFIG=descriptor_heap,breadcrumbs VKD3D_DEBUG=err in launch options.

I guess something in the debug/breadcrumbs takes care of the fence issues, because I was getting many freezes in many different areas in AC Shadows (exact same symptoms as @ragne1d), but this basically took care of them all, lets me play for hours without crashing.

The original goal of the debug build was to capture some more useful logs, but it ended up solving the issues, so... at least it works on 595 drivers (although I haven't checked 595.84 yet, but it worked with the older 595 releases, including the vulkan betas). Doesn't seem to cause much perf loss either, so it's ok as a workaround for now (using RTX 5000 series so the descriptor_heap is needed on 595 drivers to not get Xid 109s instead).

Some related discussion here on the nvidia forums: https://forums.developer.nvidia.com/t/595-release-feedback-discussion/362561/140

For anyone landing here in 2026 — this issue has evolved across multiple game patches and driver versions, so scroll to the most recent comments for your GPU generation. A few patterns that keep coming up:

• Nvidia (pre-5000 series): The original Xid 109 hang was fixed in driver 575.51.02+. If you're still on 570.x, upgrading the driver is the first step.
• Nvidia 5000 series (open kernel): The vkd3d fence/swapchain hang described by @ragne1d is still being investigated. @ssareta's workaround (debug build of vkd3d-proton with VKD3D_CONFIG=descriptor_heap,breadcrumbs) is the best known fix for now — see comment above.
• AMD 9000 series: The tiled ground texture bug on 9070 XT is a Mesa issue, not Proton — track it on the Mesa GitLab.
• Denuvo lockouts: If you switch Proton versions too many times in 24h, Denuvo rate-limits you. Only fix is to wait. This is anti-cheat / DRM policy, not a Proton bug per se — some games have stricter limits than others.

Also worth noting: if you're evaluating whether to buy a game primarily for Linux/Steam Deck, checking its anti-cheat compatibility upfront saves the "bought it and it won't launch" frustration. Community-maintained lists exist that track which anti-cheat systems work under Proton and which don't.

• Nvidia 5000 series (open kernel): The vkd3d fence/swapchain hang described by @ragne1d is still being investigated. @ssareta's workaround (debug build of vkd3d-proton with VKD3D_CONFIG=descriptor_heap,breadcrumbs) is the best known fix for now — see comment above.

@Jakeshadow That's not exactly correct, this issue is not limited to "5000 series". Well, the descriptor_heap part of the workaround is, but the original workaround I came up with (just breadcrumbs on debug build) was for my Ada GPU. On Ada, there's little to no difference between VKD3D_CONFIG=descriptor_heap,breadcrumbs and VKD3D_CONFIG=breadcrumbs.

• Nvidia 5000 series (open kernel): The vkd3d fence/swapchain hang described by @ragne1d is still being investigated. @ssareta's workaround (debug build of vkd3d-proton with VKD3D_CONFIG=descriptor_heap,breadcrumbs) is the best known fix for now — see comment above.

@Jakeshadow That's not exactly correct, this issue is not limited to "5000 series". Well, the descriptor_heap part of the workaround is, but the original workaround I came up with (just breadcrumbs on debug build) was for my Ada GPU. On Ada, there's little to no difference between VKD3D_CONFIG=descriptor_heap,breadcrumbs and VKD3D_CONFIG=breadcrumbs.

I can verify this. It's not just a "5000 series" issue. I have the following setup.

• Nvidia RTX 3060 12GB
• CachyOS Kernel Version 7.1.2-2-cachyos
• Lutris 0.5.22 (Flatpak)
• OpenGL Version 4.6.0 NVIDIA 610.43.02
• Vulkan Version 1.4.321

It took some effort as Lutris kept replacing the d3d12.dll/d3dcore.dll files and in the end dropping the debug files directly into the Assassin's Creed Shadows Game folder got the correct dlls loaded. However the crashes were still occurring with VKD3D_DEBUG=err and only went away when debug was set to trace at significant drop in frame rates.

In my case the crash does occur even with trace enabled, just not immediately as it does otherwise. Not really sure any of this is significant but here are debug outputs. When I have time I dig deeper.

1st Error:

130633.202:0614:0754:err:vkd3d-proton:vk_image_memory_barrier_for_initial_transition: Application uses placed resource (1 subresource) (cookie 54846, fmt: DXGI_FORMAT_R16G16B16A16_FLOAT, flags: #5) that must be initialized explicitly.

130712.914:0614:0750:err:vkd3d-proton:vkd3d_wait_for_gpu_timeline_semaphore: Failed to wait for Vulkan timeline semaphore, vr 2.
130712.914:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_device_lost: Device lost observed, analyzing breadcrumbs ...
130712.914:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_queue_nv: Found pending command list context [5938, 5938] in executable state, TOP_OF_PIPE marker 17, BOTTOM_OF_PIPE marker 17.
130712.914:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list_linked: === Replaying earlier command list #0 (context 5859) in submission for clarity ===
130712.914:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Cookie: 54973 (#d6bd)
130712.914:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 4294967295 (#ffffffff)
130712.914:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 2755 (#ac3)
130712.914:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 1024 ([#400](/issue/ValveSoftware/Proton/400))
130712.914:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:      Tag: Resource Transition
130712.914:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:   Command: barrier
130712.914:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:      Tag: Buffer -> Image
130712.914:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:      Tag: BufferDesc [VkBuffer VA, SuballocatedOffset, Cookie, GlobalCookie, Size, Flags]
130712.914:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_ligamemodeauto: dlopen failed - libgamemode.so: cannot open shared object file: No such file or directory
gamemodeauto: dlopen failed - libgamemode.so: cannot open shared object file: No such file or directory
00d8:err:ole:start_rpcss Failed to open service manager
gamemodeauto: dlopen failed - libgamemode.so: cannot open shared object file: No such file or directory
gamemodeauto: dlopen failed - libgamemode.so: cannot open shared object file: No such file or directory
gamemodeauto: dlopen failed - libgamemode.so: cannot open shared object file: No such file or directory
gamemodeauto: dlopen failed - libgamemode.so: cannot open shared object file: No such file or directoryst:  Set arg: 5249171456 (#138e00000)
130712.914:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 0 (#0)
130712.914:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Cookie: 51321 (#c879)
130712.914:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Cookie: 51320 (#c878)
130712.914:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 67108864 (#4000000)
130712.914:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 0 (#0)
130712.914:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:      Tag: ImageDesc [Cookie, DXGI_FORMAT, D3D12_RESOURCE_DIMENSION, width, height, DepthOrArraySize, MipLevels, Flags]
130712.914:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Cookie: 54973 (#d6bd)
130712.914:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 41 ([#29](/issue/ValveSoftware/Proton/29))
130712.914:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 3 (#3)
130712.914:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 64 ([#40](/issue/ValveSoftware/Proton/40))
130712.914:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 2 (#2)
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 1 (#1)
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 1 (#1)
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 0 (#0)
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:      Tag: SubresourceLayers [mipLevel, baseArrayLayer, layerCount, aspectMask]
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 0 (#0)
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 0 (#0)
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 1 (#1)
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 1 (#1)
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:      Tag: ImageOffsetExtent [offset, extent, bufferOffset, bufferRowLength, bufferImageHeight]
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 0 (#0)
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 0 (#0)
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 0 (#0)
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 64 ([#40](/issue/ValveSoftware/Proton/40))
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 2 (#2)
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 1 (#1)
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 60865024 (#3a0ba00)
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 64 ([#40](/issue/ValveSoftware/Proton/40))
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 2 (#2)
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:   Command: copy
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Cookie: 54973 (#d6bd)
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 4294967295 (#ffffffff)
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 1024 ([#400](/issue/ValveSoftware/Proton/400))
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 2755 (#ac3)
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:      Tag: Resource Transition
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Cookie: 665 ([#299](/issue/ValveSoftware/Proton/299))
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 4294967295 (#ffffffff)
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 0 (#0)
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 4 (#4)
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:      Tag: Resource Transition
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:   Command: barrier
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list_linked: =====================================================
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list_linked: === Replaying earlier command list #1 (context 5882) in submission for clarity ===
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Cookie: 55156 (#d774)
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 0 (#0)
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 2755 (#ac3)
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:  Set arg: 1024 ([#400](/issue/ValveSoftware/Proton/400))
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:      Tag: Resource Transition
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:   Command: barrier
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:      Tag: Buffer -> Buffer
130712.915:0614:0750:err:vkd3d-proton:vkd3d_breadcrumb_tracer_report_command_list:      Tag: BufferDesc [VkBuffer VA, SuballocatedOffset, Cookie, GlobalCookie, Size, Flags]

gamemodeauto: dlopen failed - libgamemode.so: cannot open shared object file: No such file or directory
gamemodeauto: dlopen failed - libgamemode.so: cannot open shared object file: No such file or directory
00d8:err:ole:start_rpcss Failed to open service manager
gamemodeauto: dlopen failed - libgamemode.so: cannot open shared object file: No such file or directory
gamemodeauto: dlopen failed - libgamemode.so: cannot open shared object file: No such file or directory
gamemodeauto: dlopen failed - libgamemode.so: cannot open shared object file: No such file or directory
gamemodeauto: dlopen failed - libgamemode.so: cannot open shared object file: No such file or directory

Played today for about 5 hours without crashing.

• --buildtype=debugoptimized built dlls
• Following overrides:
  • VKD3D_CONFIG=descriptor_heap,breadcrumbs
  • PROTON_VKD3D_HEAP=1
  • VKD3D_DEBUG=err
  • WINEDLLOVERRIDES=d3d12,d3d12core=n

Hello everyone,

I tested the workaround mentioned by @ssareta above: building vkd3d-proton in debug mode, replacing Proton’s D3D12 DLLs with the newly built ones, and adding the following environment variables to the launch options:

VKD3D_CONFIG=descriptor_heap,breadcrumbs VKD3D_DEBUG=err

It worked very well. I played for around six hours yesterday without encountering any deadlocks (RTX 5080, latest CachyOS version).

That said, I hope the team can provide an official fix soon.

Replying to https://github.com/ValveSoftware/Proton/issues/8543#issuecomment-4956994379

For me currently happens even when tried this fix.
Fedora 44 KDE, 610 driver from rawhide repo, latest cachyos-proton, Heroic Launcher -> Ubisoft Connect
With RTX4070Ti Super && Ryzen 7600X.
Tried also with praz01 arguments and debugoptimized build instead of debug build. Same thing, game just freezes always in certain areas.

Replying to [#8543 (comment)](https://github.com/ValveSoftware/Proton/issues/8543#issuecomment-4956994379)

For me currently happens even when tried this fix. Fedora 44 KDE, 610 driver from rawhide repo, latest cachyos-proton, Heroic Launcher -> Ubisoft Connect With RTX4070Ti Super && Ryzen 7600X. Tried also with praz01 arguments and debugoptimized build instead of debug build. Same thing, game just freezes always in certain areas.

What are you breadcrumbs trace output before the crash? Which location are you experiancing the issue in?

Might as well post here, in case not everyone is watching vkd3d-proton repo issues…

I got somewhat tired of waiting for this hang on NV 595+ 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, including on release builds with breadcrumbs disabled, 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.