

"Failed to load the anti-cheat module."

When trying to start the game out of the box I would get an Easy Anti-Cheat error, in order to fix this I needed to install both glibc-eac and lib32-glibc-eac from the AUR. You can install these packages with the following command (the flag is required or it will complain about conflicting packages):
yay -S glibc-eac lib32-glibc-eac --mflags "--nocheck"
If you are curious why some Easy Anti-Cheat games require an EAC patch while others don't its because free games (especially older ones) can be an easy entry point for finding anti-cheat bypasses as people can mass create accounts to test if they get banned, because of this Easy Anti-Cheat will use older versions of their software for these games so that even if a bypass is found it will not affect the more popular titles, these older versions happen to not work very well with newer versions of Linux
on KDE 6 (Nobara Linux) mouse vertical axis going higher to the top

Game works
First time I tried launching it didn't load, but restarting the game made it load fine

Windowed Fullscreen was not fully full when setting the resolution to 720p,changing to 'Fullscreen' made it full at 720p
The game Frequently doesnt launch,i restarted steam a lot of times to get it runnung.

Game doesnt laucnch anymore
I got a dxvk error

mangohud %command%
Windowed Fullscreen was not fully full when setting the resolution to 720p,changing to 'Fullscreen' made it full at 720p
The game sometimes does not launch,restarting steam fixes it. The game started to crash steam repeatedly,it opened then closed,when i restarted steam it was still crashing. I tried to restart,but the restart hang,i did a Hard reset.
Game works, but has problems.

gamemoderun %command%
After one match, fps in the game drops very badly, you have to restart the game
Game often fails to launch.
The game even on Windows is quite unstable, it has a lot of bugs, and on linux everything will be even worse.

works OOTB
A few stutters while using Proton 7 (shader compilation ?), none using Proton Experimental
No major issues while playing
When loading into a map that has not been played before it lags the game for a while but when textures get loaded the game starts working like it should.
If you have a better setup than me (that's not hard :P) or if you lower your res a bit, it should work fine.
When you play, try to only play in either windowed or borderless, as setting fullscreen first makes the game full black, then when you restart you can't alt-tab else it does that again.
Compared to windows (I have a dual boot) there's a major diference, it's way more laggy (around 2-5 fps while in the tutorial...), even on full low. I changed my res to 1366x768 and it ran at a good framerate.
This is a tinker report because i use proton GE but it works the same with the latest proton (7.0.6 at the time of writing)
It goes into the main menu but after a little while it gets stuck and can't do anything, but close the game
gamemoderun mangohud %command%
After playing a few games, it is possible that parts of models will start disappearing, which progressively gets worse in the following rounds until walls and floors are entirely missing and game is unplayable. Restart usually fixes.
Alt-Tabbing forces window to minimize and move to different screen most of the time. You have to unminimize, move window to the proper screen, but then the resolution used for mouse position is messed up and it is majorly offset. To fix this, I have to minimize the window and unminimize, hoping that the window does not move to another screen when it minimizes. It has to unminimize on the correct screen to have proper mouse position.
Issues described in fullscreen section
Semi-frequent crashes, freezes
Frequently have issues file integrity errors. Somewhat often game will crash while loading match, or will kick you to main screen.
I keep playing this game and it's a pretty infuriating experience sometimes, but I can usually get about 30 minutes of smooth gameplay. The fullscreen issues are persistent and the worst part of the experience, as you can't focus any other window without causing the minimize and subsequent mouse issues. I am using AwesomeWM which could be related to those specific issues, but this is the only game I have this level of window issues with.
EAC is blocking multiplayer
On Proton 4.11-13, 5.0-10 EAC doesnt allow to start searching the game because "anti-cheat setup failed", on 5.13-6 EAC doesnt allow to start searching the game because: (error 5) Unknown file verion (bin/win_x64/msvcp120.dll). On other versions of proton game doesnt even start because of "Unsupported graphics card detected. A GPU with support for D3D FeatureLevel 11.0 is required.", "CrySystem init failed". :(
Error, then black screen
DXVK_FILTER_DEVICE_NAME=""
When launching the game, I get a popup saying "Plugin load failed, could not find dynamic library CryPerceptionSystem!"
When using launch options, I am able to see the logo intro screen to the game, afterwards just a black screen forever.
I tried verifying game files without luck.
don't let the silver rating scare you, this runs great OOB
After some games some textures/models stopped loading, but restarting the game solves the problem.
DRI_PRIME=1 gamemoderun %command%
Sometimes after the game launch, it throws an error with file verification. It just requires a restart. The very rare case is also I get kicked out in the middle of the game, probably by EAC.
DRI_PRIME=1 gamemoderun %command%
With latest Proton-GE/Experimental, finally EAC lets to play Deceit online.
Only played one game, but all good things so far
Game launches but matchmaking gets cancelled due to EAC
Wouldn't work with proton experimental or proton 7.01

EAC
1645177744 experimental-7.0-20220218b

EAC
1644817768 7.2-GE-2

EAC
1644626092 proton-7.0-1
EAC kicks me out of the lobbies
Game’s anticheat kicks you out of lobbies as soon as games start.
Kicked from games after a few seconds, most probably because of anti-cheat software.
Kicked from every games after a few seconds
Easy-Anti-Cheat kicks you from games
Game uses EAC, but it won't launch anyway, so it doesn't matter.

doesnt load, all the reports saying it does are from before EAC was added to the game
the issue with EAC could possibly be fixed with the release of steam deck tho
I think all the reports saying it was working may have been before EAC was added
Runs out of the box. Needed to set graphics to low because my hardware, but after that it ran smooth 60fps
It launches and plays okay, but the FPS was unexpected low. Very choppy.
Low FPS
Froze up when exiting
Used Proton 5.13
Doesnt let me join a match
DefaultLimitNOFILE=524288
harder to switch windows
slow to load
Around 10 FPS with low preset
VRAM usage: around 3 GB
5.21 GE
Use Proton-5.9-GE-5-ST ( https://github.com/GloriousEggroll/proton-ge-custom/releases). Without it game crashes after joining into the game.