
Works perfectly ootb

Great
Thrustmaster T300 RS works perfectly here. There is a problem that the system does not detect the steering wheel inputs, so the screen goes into dim mode after a while. I have to disable this option in power options so that I don't have to type or move the mouse for the system to know that I'm still using the computer. Although the system does not detect it, the game detects all the steering wheel buttons and pedals normally.

Small, but readable.
I love this game os desktop with steering wheel. I'm surprised that I enjoyed so much to play on steam deck.

Single player runs well on my Steam Deck with room for higher quality visuals and/or performance if you're willing to tradeoff battery life
40 FPS / 80hz at Medium preset with textures set to Medium and Intel XESS to Quality
Some non essential HUD elements may be small

don't use alt+tab or similar things when using fullscreen. when you switch back to the game, it show only black screen with no audio and no response to keyboard or controller, then you have to kill the game process
check video opinions - advanced. if "Texture Quality" was set to high or above, game will very likely to crash after race finish. change it to medium or below
seems they fixed ea account login now...

Funciona bien pero sin el modo en línea
No conecta cuenta: sin en línea.
A EA se la suda no puedo recomendar este juego. No tiene en línea. Lo demás va perfecto.

Works OOTB on Proton 8.0.5
Runs perfectly on Xubuntu 22.04, Steam Flatpak

Put a screen on 40hz to play smooth, medium graphic settings
But is something wrong within the game when you search lobbies, if you can't find nothing search by choosing specific circuit/track
40hz recommended to play smoothly

Installs and starts up fine - used medium settings for most graphic options and looks great.
DXVK_ASYNC=1 mangohud %command%
On NVIDIA, you can disable the AMD driver launch error by adding dxvk.conf in the game's install dir, and adding dxgi.nvapiHack = False to it
A+ except multiplayer support
Use the latest proton GE if you want play multiplayer
I know game works with official proton but only single player, I always want play multiplayer and when I finally get proton GE which is easy to instal on steam deck, I tried force latest proton GE that I have 8.1 I think, to see if multiplayer will works, and YES it works.
N/A
Runs right out of the box as of this date. 60fps easy, runs great, plays great. Default controls are perfect. Definitely worth it if you have EA Play.
DXVK_ASYNC=1 WINE_FULLSCREEN_FSR=1 WINE_FULLSCREEN_FSR_STRENGTH=5 gamemoderun %command%
Perfomance boost with DXVK_ASYNC=1, FSR 1080p to 1440p high preset I get ~70fps. G29 wheel works out of the box, only pedals need to be reassigned.
T300RS GT Clutch and Accelerator doesn't respond at all, the GRID games all react the same way. It's full gas all the way, and I can't change to the pedals, because it doesn't register. Breaks work though, and other games have no problem.
The game can't connect to the servers
Runs perfectly OOTB, except Multiplayer.
issue reported on feb 2022 - keeps crashing after some time (https://github.com/ValveSoftware/Proton/issues/5619)
Freezes after some races, pc needs to be restarted, but saves game progress.
Freeze
Single player runs perfectly so far without any issues.

Requires far too much tinkering to be worth the trouble. You get about five hours' gameplay for your trouble.
Install Wine Mono, Wine Gecko, corefonts, d3dx9, d3dcompiler_43, d3dcompiler_47 for the EA app, as described in https://github.com/kageurufu/steamdeck-tricks/blob/main/ea-app.md
Error about driver version interrupted launching the game, causing the game to think it's focused when it's not. Workaround is to not touch it, wait for the EA App to take focus back, then close the error dialog using Steam's windowing menu.
Weird windowing bug with the driver version error.
EA cloud saves don't work
Multiplayer fails to connect.

GEproton for lutris' wine don't what version sorry
tried many ge protons for steam and lutris' wine

Once installed an running it's pretty much flawless. No crashes, no performance issues (that couldn't be fixed by settings tweaks). Is fun!
Locked it to 40fps and 40Hz
Pop up suggesting the driver is out of date. Just click 'OK'
No online stuff works. Just you v.s. the AI until that one is fixed.
Game is unstable to the point of being unplayable. Work for a dream for a few races but stopped working entirely after about an hour.
Rumbled did not work
Worked originally, now crashes on start everytime.
Cannot connect to Origin servers
DXVK_ASYNC=1 %command%
The DXVK_ASYNC=1 launch option seems to help the game run more smoothly. I have not had any crashes or other issues so far and have been able to complete a few of the story mode events.
Updated to SteamOS Beta branch to resolve crashing issues.
Grip buttons = paddle shifters!
I don't think it's possible to play online because the EA login prompt wasn't working for me, but I did not spend much time trying.
Game crashes after race or benchmark
Game runs perfectly fine but crashes after a race or benchmark (RX6700XT)
Frequent hard-locks render the game unplayable. I was unable to complete a single race.
Frequent hard-locks render the game unplayable.
Unable to connect to EA/Codemaster servers during initial multiplayer selection.

Seems to work for some races.
Stutter of game and audio, but I could finish the race when it happened. Game saved the result, but crashed afterwards.
Game crashed after Alt-Tab.
Could play fine for some races, then it crashed
Game reported that I should download the newest AMD drivers for my GPU, as older drivers may crash.
Career worked fine for some races, then a crash happened while saving. Save was fine, but had to hard-reset the laptop.
Story worked flawlessly so far
Online Services seems to be unable to connect
FPS was same as Windows, but pacing is quite inconsistent on some tracks
Crashes after most races
Can't connect to online services
Runs fine if you can withstand the crashing after each race.
ALWAYS crashes after a race, no idea what's causing it. Tried using different versions of Proton, Proton GE, upgraded graphics drivers, etc. Runs great otherwise.
Even though I'm using an NVIDIA graphics card, the game thinks I'm using AMD, since I get a little error upon launch saying my drivers aren't up-to-date...https://i.imgur.com/b0rO7N3.png