TL;DR: Expedition 33 works well enough with DualSense controllers on Fedora 42 using Flatpak Steam + Proton Experimental (July 2025) with specific configuration steps.

System Setup

• OS: Fedora 42
• Steam: Flatpak version (com.valvesoftware.Steam)
• Controller: Sony DualSense (PS5) controller via USB
• Hardware: ASUS ROG Z790 Maximus Dark Hero, RTX 4080 Super, 48GB DDR5

The Problem

Initial Issue: DualSense controller was detected by Steam and worked in Big Picture Mode, but Expedition 33 completely ignored contoller input. The game seemed to detect the controller's touchpad as a trackpad input, but no buttons, sticks, or triggers worked in-game.

Error Symptoms: - Controller visible in Steam settings - Controller worked in Steam Big Picture Mode - jstest showed controller input on system level - Native Linux games didn't see the controller - Wine joystick control panel only showed keyboard - Expedition 33 showed message about DualSense support but no actual input

Root Cause Analysis

The issue was multi-layered:

1. Flatpak Steam permission - Steam couldn't properly access controller devices
2. Missing udev rules - Linux didn't have proper controller device rules
3. System-level input detection - Games couldn't access controller through Wine/Proton
4. Game-specific configuration - Expedition 33 needed exact Proton settings

Solution Steps (In Order) Step 1: Install System-Level Controller Support

```bash

Install controller device rules

sudo dnf install steam-devices

Reload udev rules

sudo udevadm control --reload-rules sudo udevadm trigger

Add user to input group

sudo usermod -a -G input $USER ```

Logout/login required after adding to input group

Step 2: Fix Flatpack Steam Permissions

Install Flatseal:

bash flatpak install flathub com.github.tchx84.Flatseal

Configure Steam permissions in Flatseal:

1. Open Flatseal - Find Steam
2. Socket Section:
   • [X] D-Bus session bus
   • [X] D-Bus system bus
   • [X] Inherit Wayland socket
3. Device Section:
   • [X] GPU Acceleration
   • [X] Input Devices
   • [X] Shared Memory
4. Filesystem Section:
   • Add to "Other files": /run/udev:ro and /dev/input
5. Variables:
   • ENABLE_VK_LAYER_VALVE_steam_overlay=1
   • ENABLE_VK_LAYER_VALVE_steam_fossilize=1

Restart Steam:

bash flatpak kill com.valvesoftware.Steam flatpak run com.valvesoftware.Steam

Step 3: Configure Controller Environment

Add to shell config: I use fish; change accordingly for your shell

bash echo 'set -gx SDL_JOYSTICK_HIDAPI_PS5 1' >> ~/.config/fish/config.fish echo 'set -gx SDL_GAMECONTROLLER_USE_BUTTON_LABELS 0' >> ~/.config/fish/config.fish source ~/.config/fish/config.fish

Step 4: Fix uinput Access (for testing tools)

```bash

Create udev rule for uinput

echo 'KERNEL="uinput", GROUP="input", MODE="0664"' | sudo tee /etc/udev/rules.d/99-uinput.rules

Reload and load module

sudo udevadm control --reload-rules sudo udevadm trigger sudo modprobe uinput ```

Step 5: Verify System-Level Detection

Test controller detection:

```bash

Check if controller appears

jstest /dev/input/js0

Test with AntiMicroX

sudo dnf install antimicrox antimicrox ```

Test Wine detection:

```bash

Create test Wine prefix

WINEPREFIX=$HOME/wine-test wincfg

Set DPI to 144+ for readability without a magnifying glass Test controller in Wine

WINEPREFIX=$HOME/wine-test wine control joy.cpl ```

✅ Success indicators:

• jstest shows button/stick input
• AntiMicroX detects controller
• Wine joystick panel shows DualSense (not just keyboard)

Step 6: Configure Steam Controller Settings

Global Steam Settings:

• Steam > Settings > Controller > General Controller Settings
• ✅ PlayStation Controllers
• ✅ Generic Gamepad Configuration Support

Test with a known-working game first:

• Try Cult of the Lamb or Portal 2 to verify Proton controller support

Step 7: Expedition 33 Specific Configuration

❌ What DOESN'T work:

• Older Proton versions (8.0, 7.0) - game won't launch
• Custom launch options (gamemoderun, PROTON_USE_DINPUT8)
• Forcing Steam Input off for this game
• Using PROTON_USE_WINED3D=1 (causes severe performance issues)

✅ Working Configuration:

Game Properties > Compatibility:

• Force Steam Play: ✅ Enabled
• Tool: Proton Experimental

Game Properties > Controller:

• Steam Input: Use Default Settings (enabled)

Game Properties > General:

• Launch Options: (completely empty)

Global Controller Settings:

• Xbox Controller: (default)
• PlayStation: Enabled (general setting)
• Nintendo Switch: (default)
• Generic Controller: (default)
• Steam Controller: Enabled (always required)
• Remote Play: Enabled (always required)

Troubleshooting Guide If controller still doesn't work in games:

Check system-level access:

```bash

See what's using the controller

lsof /dev/input/js0

Kill Steam completely and test

pkill -f steam flatpak kill com.valvesoftware.Steam jstest /dev/input/js0 ```

Test native vs Proton games:

Native Linux games should work if system setup is correct Proton games need additional Steam configuration

If specific games don't work:

• Test with known-working Proton games first
• Match exactly the settings of working games
• Try different Proton versions (but Experimental works best for Expedition 33)
• Clear all launch options and use defaults

Common Pitfalls:

❌ Don't do these:

• Don't use multiple launch parameters at once
• Don't force older Proton versions for new games
• Don't disable Steam Input if Steam's global controller support is working
• Don't use custom Wine prefixes for Steam games

✅ Do these instead:

• Test one change at a time
• Use minimal configuration that works
• Copy settings from working games
• Verify system-level detection before blaming games

Alternative Methods Tested

These approaches were tested but didn't work for Expedition 33:

RPM Fusion Steam (native package)

```bash

Tried but has anti-cheat compatibility issues; not an issue here, but for other games

sudo dnf install steam ```

Result: Better controller support but triggers anti-cheat flags in some games.

Lutris

bash sudo dnf install lutris

Result: Alternative launcher but didn't solve core input detection issues.

Manual Proton launch parameters

```bash

These didn't work for Expedition 33:

PROTON_USE_DINPUT8=1 %command% PROTON_USE_WINED3D=1 %command% SDL_GAMECONTROLLER_USE_BUTTON_LABELS=0 %command% ```

Hardware-Specific Notes

In case they are relevant, I am still pretty noobish with trying to troubleshoot Linux Gaming problems.

ASUS ROG Z790 Dark Hero

• Above 4G Decoding: Enabled
• Re-Size BAR: Enabled

RTX 4080 Super

• NVIDIA Driver: 575.64.03 (via negativo17 repository)
• GPU used: For game rendering (controller input is CPU/USB independent)

DDR5 Memory

• Memory speed during testing: DDR5-4800 (stable)
• Controller input unaffected by memory configuation (tried many between 4800 and 8000MHz)

Final Working State

System verifiction commands:

```bash

Controller detected

jstest /dev/input/js0

Steam sees controller (Check Steam → Settings → Controller) Wine detects controller

WINEPREFIX=$HOME/wine-test wine control joy.cpl

Game launches and responds to controller (Expedition 33 with exact settings above)

```

Button prompt limitation:

• Game shows Xbox button prompts instead of PlayStation symbols
• Gameplay fully functional - all buttons, sticks, triggers work perfectly

I am hoping I can figure out how to get the Native Dualsense support working (sans Steam Input), but for now I am brain dead and just want to play Expedition 33.

Sorry for the book, but getting this far took me a lot of reading snippets from various places, trying a lot of things, and ~6 hours... So, if this saves even one person that amount of time, its worth the wall to me!

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I personally dont want to relearn new command if i dont have too, BUT i will move to Nobara if that is superior.

12th Gen Intel(R) Core(TM) i7-12700F (20) @ 4.90 GHz
NVIDIA GeForce RTX 3060 Lite Hash Rate [Discrete]

Memory: 4.64 GiB / 15.43 GiB (30%)

Swap: 192.02 MiB / 4.00 GiB (5%)

(expecting to play game like MH|W and Helldivers if that gives more info, they ran fine on my windows, but honestly id rather deal with Linux Gaming Headache then windows)

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When i try to run the game without any configuration, it just closes without any message.

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FNA3D_FORCE_DRIVER=OpenGL %command%` launch option

Browning a bit, i found that use vulkan instead of opengl (`FNA3D_FORCE_DRIVER=Vulkan %command%`) could work, but when i try it i get these error messages:

`FNA3D_FORCE_DRIVER=Vulkan %command%` launch option

System information:
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This one is clear Linux domination

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I'm probably getting insane, but here is an idea:

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On lower-core-count machines (like Steam Decks or typical AMD systems), it's probably less noticeable, hence why I haven't found anyone with a similar issue online.

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If anyone has a fix let me know, I’d love to get the benefits of gamemode without the core lock. Otherwise let this be a PSA to anyone who might be having performance issues.

I have reported this on the Repo, but just also posting here for awareness as alot of people may not interact with gits.

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