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Works out the box on latest Proton
Game installs and plays without issue. I noticed that it struggled to keep 60FPS, but based on other forums, this is not a Linux issue - and my hardware is not very powerful.

Inicia y funciona perfecto: Terminado al 100%, 1080p, graficos(personalizado), control(xbox one/series), Proton=8.0-4
Configuracion de Video:
Opciones avanzadas:
- Version de DirectX = DX11
Graficas:
- Calidad Predeterminada = Personalizado
- Calidad de las sombras = Alta
- Calidad de textura = Media
- Calidad de distancia visual = Alta
- Calidad de efectos = Media
- Calidad de follaje = Media
- Calidad de posprocesamiento = Media
- Calidad de anti-aliasing = Media/Alta>(Cuando obtienes la glandula y, comienza a parpadear la pantalla)

With these settings, you'll be able to play fine, just be aware that you will have thick vertical black bars on each side of the screen.
Set shadows to high and then set the game resolution (ingame or from the properties menu on steam) to 1024*768, otherwise the game's FPS will drop to the low 20.
The game has an unresolved bug where if your shadows are not set to high, then some areas will be covered in a thick white fog. This is not a game mechanic (like the fog of war) nor an optimization technique (like the drawing distance). It's a bug. Only workaround is to set the shadows to high, which kills the performance.
In order to play the game at a decent 30fps, you have to set the resolution to 1024*768. This will give you black vertical bars on each side of the screen but the game will be playable.
Ingame settings Resolution: 1024*768 Display mode: Windowed Shadow Quality: High Texture Quality: Medium View Distance: Low Effects Quality: Low Foliage Quality: Medium Post Processing Quality: Low Anti Aliasing: High

The game just works

Part of the screen turned black in the final boss fight, annoying but manageable. Had no other issues throughout the game.
Some of the options in the settings menu have a different impact on performance than you'd expect. DX11 performs way better than DX12 and DLSS also makes performance worse. With DX11 and without DLSS the performance is very good.
Game started right up with regular Proton as well as GE. Made changes to graphics and Decks performance options for input lag. Good overall.
Game Settings: (Framerate: Unlimited, V-Sync: No, Quality is high texture with low post-processing, AA, and effects, everything else was medium-ish settings)
Steam Deck Perf: (Framerate Limit: 40FPS, Refresh Rate: 40Hz, Allow Tearing: Enabled)
I found no issues with this game on my Deck. Just needed some graphics tweaking for 40FPS cap with 40hz and it was good to go. The Deck always has a bit of an input lag, especially for some of these larger games (Mortal Shell, Whicher 3, Nioh 2, ER). Still, I love playing anywhere I go and I'll take it.
SD card didnt' seem to effect load times or general performance at all.
Great out of the box experience

Kernel: linux-zen
Launch option: AMD_VULKAN_ICD=RADV
All settings ULTRA @ 2560x1440p. Between 80 - 130 FPS.
You probably don't need to use AMD_VULKAN_ICD=RADV %command%
launch option as the game should work with default AMDVLK
too. Same goes for linux-zen
, though I didn't test either of those.
Works as expected with default proton.
works out of the box
Works perfectly out of the box!
Use DX12 to get some more fps!

Everything works perfect (linux-zen / proton experimental)
Game takes back focus and covers up whatever I open with Alt+Tab. Plasma dock visible, so I right-clicked running apps in the taskbar and moved them on the other screen. Game is set to fullscreen.
I got a few more fps with RADV
then with AMDVLK
driver (Radeon RX 580).
Just install vulkan-radeon
and lib32-vulkan-radeon
(from multilib repo) and add AMD_VULKAN_ICD=RADV %command%
to the steam game launch options to try it out.
Proton-6.15-GE-2
The game performs significantly better when the "DirectX Version" video option is set to DX12
6+ hours, no problem so far.
Runs perfect out of the box.

It stuttered a lot on the mainline kernel, but on zen it runs as good as it did on Windows 10. If you get stutter, try to find out how to install the fsync kernel patch on your system or find a kernel that includes it.
If your EpicGames is stuck updating, try reinstalling wine using Glorious Eggroll's "How to get out of wine dependency hell" guide, and then reinstall EpicGames.
Installed Epic through Lutris and installed the game. Works perfectly, will lag if you try to stream the game on discord.

Gameplay on Ubuntu 20.04 with PS4 Controller https://youtu.be/WdNzGcg55vY
Installed the game using Legendary. Added "Non-steam" game to steam. Selected latest version of Proton. Runs in 1440p with no issues

It can be recourse demanding, but on my setup runs ~90fps 2k ultra settings Install Epic Game Store, runs without it ;)
I'm using proton-5.9-GE-2-MF didn't check the default one

Install EGStore by Lutris, or install it on Steam. Install game. Option1: lutris-EGS-game. Opt2 steam-add to lib dungeonheaven.exe w/t EGS
Proton 5.9-GE-2-MF GloriousEggroll
https://github.com/GloriousEggroll/proton-ge-custom/releases

Installed epic games store with Lutris then installed the demo. Worked perfectly out of the box with no issues.
Played the demo, finished the tutorial, killed the hidden vampire boss at the start of the first area and cleared it as well.