

Roda perfeito, melhor que no Windows, que tem um bug com Vsync ou algo do tipo que deixa a tela tremendo.
Utilizando o Proton GE, o jogo rodou perfeitamente e melhor que no Windows, estável e sem quedas ou travadas.

Works great out of the box.

Runs fine! No Audio issues, no slow downs. Only minor thing is fullscreen does not work when game resolution does not match screen resolution.
Game does not launch - Failed creating the Direct3D device. Works on Windows.

Proton-6.21-GE-2 required to fix missing audio
Audio and video for cutscenes do not work out of the gate. They're the only thing about the game that is busted. Proton-6.21-GE-2 fixes this
The entire game works, except for cutscenes. Cutscenes do not load and result in the standard test pattern. To fix this, you will need to switch the compatibility option to GE-Proton 6
You can get the latest GE-Proton 6 here: https://github.com/GloriousEggroll/proton-ge-custom/releases/tag/6.21-GE-2
Copy the archive (Proton-6.21-GE-2.tar.gz) to ~/.local/share/Steam/compatibilitytools.d and then extract it.

Street Fighter IV appears to work correctly with up to GE-Proton 6.
Using newer GE Using GE-Proton 7/8/9, audio will NOT work in video cutscenes.
Using Steam Proton, video will give you the test patterns.
You can get the latest GE-Proton 6 here: https://github.com/GloriousEggroll/proton-ge-custom/releases/tag/6.21-GE-2
Copy the archive (Proton-6.21-GE-2.tar.gz) to ~/.local/share/Steam/compatibilitytools.d and then extract it.
With all graphic settings maxed you can get a solid 60 FPS (LCD) or 90 FPS (OLED).

Intro videos are silent
Going with Steam Proton gives you the test pattern videos. Going with GE-Proton gets the videos to display, but there is no audio. Strange seeing so many reports that the game works fine.

As some other reports have said, the cutscenes along with some other graphical and audio bugs occured with any version of Proton or Proton-GE 7 and above. I switched to the lastest version of Proton GE 6 and had no issues after that.

Es muy inestable el juego.
En el modo historia no se escuchan nada las escenas animadas.
La mayoria de las veces se cierra o no inicia.
A veces se cierra sin razón alguna o se pasma.

Se crashea el juego o no abre. Si no esta conectado a internet no inicia.
La mayoria de las veces no abre.
La mayoria de las veces no abre. Si no hay internet no inicia.

Falta el audio en las escenas del modo historia
Solo el detalle del audio en escenas del modo historia y no poder ver el juego en pantalla completa.

No veo problema. Se juega bien :D

OOTB. Tweaking the settings will make it better.
Playable on Steam Deck. Enjoy.

May encounter "synchronizing Steam cloud" during first run. Simply exit and restart the game.
GE is necessary for video issues, after which point it works perfectly.
funciona muito bem com otima estabilidade
alt+tab faz com que congele, tendo que reiniciar
somente a troca de janela congela o jogo, tentei ajustar usando outros protons GE e os que a steam recomenda por padrão mas não tive sucesso.
you have to activate fullscreen in this config file: /.steam/steam/steamapps/compatdata/45760/pfx/drive_c/users/steamuser/Documents/CAPCOM/SUPERSTREETFIGHTERIV/config.ini
Otherwise, the game runs perfectly
The used version of Proton-GE because is the only one that I got all the cutscenes working with audio, with Proton experimental, the final cutscene of some characters doesn't work, with newer Proton-GE version (7.0 or above), all cutscenes work but with no audio.
Runs pretty nicely on the latest version of Proton.
Stuttering audio
Slightly lower fps than on Windows, but that may be because my pc is no very good.
PROTON_USE_WINED3D=1 %command%
Without the PROTON_USE_WINED3D option, I had vulkan/DX11 problems and the game didn't launch.
Perfect using Proton 7.0-3 flatpak community build.
PROTON_NO_D3D11=1 %command%
With japanese audio on in story mode; arcade cutscene plays without sound.
With japanese audio on in story mode; game open another window in the first cutscene, freeze in the last and, sometimes, crashes in the last cutscene.
For some reason enabling the japanese voice lines in story make the problem with cutscenes worse, but only enabling the voice lines in battle has no down effect.

No sound in movie cutscenes
No sounds during movie cutscenes, but everything else works fine.
Works perfectly fine
No other issues found
No audio in cutscenes

Story cutscenes have no audio
Slight stuttering during cutscenes
Game will occasionally crash when a story cutscene starts
I didn't need to do anything, worked out of the box. However I did not try online gaming as it doesn't matter for me. PS5 Controller worked well in Bluetooth as well.

in arcade mode : opening cutscene does play, ending cutscene does not play, game is frozen.
stutter in fights while Steam deck builtin fps limiter is activated. I had to put it off and ativate vsync + fixed framerate ingame.
game frozen on an unplayable cutscene at the end of arcade mode
It's too bad that builtin fps limiter (gamescope) introduces stutter on this game. Luckily game's vsync does the job.

Game works flawlessly @60 fps on highest graphical settings.
no tinkering needed
Minor frame drops in fights
The frame rate issues make it unplayable for competitive play, but is otherwise fine if you're a casual fighting game fan like myself. Had to use GE-Proton for cutscenes to play, but even then had some audio issues with cutscenes.

Need to edit compatdata/45760/pfx/drive_c/users/steamuser/Documents/CAPCOM/SUPERSTREETFIGHTERIV/config.ini in order to use fullscreen
Video and cutscenes not playing

Proton-6.21-GE-2 GloriousEggroll
Stages show only a blueprint instead of full texture. (i have a similar problem with sfxtk)
FPS was unstable until i decreased the resolution and went full screen (with Alt+Enter)
I did not try any bundled versions of proton, GE seemed like a better option.

Proton-6.14-GE-2 GloriousEggroll
Proton-6.14-GE-2