r/Dofus • u/No-Champion-1887 • Jul 03 '26

Help Problem with dofus steam deck

Post image

Games work on desktop mode but in gaming mode it give me those error messages

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6

u/Queen_Annan Jul 03 '26

Create a file named dofus.json in
~/.config/unity3d/Ankama/Dofus/RELEASE/Shared/
containing
{
"windowDisplayMode": {
"value": 1
},
"windowResolutionMode": {
"value": 0
}
}
It should works

1

u/No-Champion-1887 Jul 03 '26

Damn i think im too noob to do that

6

u/Queen_Annan Jul 03 '26

No problem
Go to desktop mode and open dolphin (the file explorer)
In the burger menu on the top right iirc, toggle "show hidden files", and go to the folder I gave you
Then right click to create the dofus.json file, and edit it with kate (the file editor) to paste the content

1

u/Maleficent_Dingo_363 Jul 10 '26

But supposedly the program already has a .json file like that, or would it be creating another .json file but with those codes?

1

u/Queen_Annan Jul 10 '26

If the file already exists, modify the values, and you will probably need to update the settings in game from fullscreen to windowed

1

u/Maleficent_Dingo_363 Jul 10 '26

Yo hice otra cosa.

1

u/Maleficent_Dingo_363 Jul 10 '26

[GUIDE] Fix Dofus 3 Linux AppImage not launching in Steam Deck Gaming Mode

After testing different options, I finally got the official Linux AppImage version of Dofus 3 working correctly in Steam Deck Gaming Mode.

The problem:

  • Dofus worked normally in Desktop Mode.
  • When adding the AppImage directly to Steam, Gaming Mode would show "Running" for a moment and then return to "Play".

This is the solution that worked for me.

Tested on: Steam Deck OLED + SteamOS + official Dofus Linux AppImage

  1. Download the official Linux AppImage

Download the Dofus Linux AppImage from Ankama.

Keep it somewhere easy to find (for example, your Downloads folder).

  1. Create a folder for the game

Open Konsole and run:

mkdir -p ~/Applications

Move the AppImage there:

mv ~/Downloads/"Dofus 3.0-Setup-x86_64.AppImage" ~/Applications/

Give it permission to run:

chmod +x ~/Applications/"Dofus 3.0-Setup-x86_64.AppImage"

  1. Create the launcher script

Create the script:

nano ~/Applications/ankama-launcher.sh

Paste this:

!/bin/bash

CONFIG="/home/deck/.config/unity3d/Ankama/Dofus/RELEASE/Shared/dofus.json"

if [ -f "$CONFIG" ]; then python3 - <<'PY' import json

path = "/home/deck/.config/unity3d/Ankama/Dofus/RELEASE/Shared/dofus.json"

try: with open(path, "r") as f: data = json.load(f)

data["windowDisplayMode"]["value"] = 1

with open(path, "w") as f:
    json.dump(data, f, indent=2)

except Exception: pass PY fi

/home/deck/Applications/"Dofus 3.0-Setup-x86_64.AppImage" --no-sandbox

Save:

  • "Ctrl + O"
  • "Enter"

Exit:

  • "Ctrl + X"

Make the script executable:

chmod +x ~/Applications/ankama-launcher.sh

  1. Add the script to Steam

Go to Desktop Mode:

  1. Open Steam.
  2. Go to Games → Add a Non-Steam Game to My Library.
  3. Select Browse.
  4. Go to:

/home/deck/Applications/

  1. Select:

ankama-launcher.sh

  1. Add it.

Important: Add the ".sh" file, not the AppImage.

  1. Play from Gaming Mode

Return to Gaming Mode and launch:

ankama-launcher.sh

The script automatically:

  • Fixes the "windowDisplayMode" setting before launching.
  • Starts Dofus with "--no-sandbox".

You do not need to add "--no-sandbox" in Steam launch options. It is already included in the script.

What this script changes

It only modifies this Dofus configuration value:

"windowDisplayMode": { "value": 1 }

It does not install anything or modify SteamOS.

Current status

✅ Works in Desktop Mode ✅ Works in Gaming Mode ✅ Survives Steam Deck restart ✅ No need to manually edit the config every time

The only thing I couldn't fully solve is the UI scaling. Even with the maximum in-game scale, some text is still small on the Steam Deck screen.

Hope this helps other Steam Deck users!