[BUG]: Logitech G27 wheel works in PCSX2 on Linux/Steam Deck, but Force Feedback does not work in Gran Turismo 4

[lucasnrv-a11y]

Describe the Bug

I am trying to use a Logitech G27 on Steam Deck / Linux with PCSX2 for Gran Turismo 4 / GT4.

The wheel is detected correctly by the OS and by PCSX2:

Steering works

Throttle works

Brake works

Button inputs work

However, Force Feedback does not work at all in-game.

The wheel and FFB are confirmed working outside PCSX2:

ETS2 force feedback works

BeamNG force feedback works

Oversteer works

new-lg4ff is loaded correctly

So this does not appear to be a hardware issue or a Linux driver issue.

PCSX2 Configuration

Controllers configured in PCSX2 directly

USB Port 1 set to Wheel Device

Tested with:

Driving Force Pro

Driving Force Pro (rev11.02)

Force Feedback field can be set and currently shows SDL-0

Steering / throttle / brake are mapped correctly

Also tested different relevant wheel settings in PCSX2, including:

Steering Smoothing

Steering Deadzone

Steering Damping

Workaround for Intermittent FFB Loss

None of these restored FFB.

What Happens

Wheel input works normally.

No force feedback in GT4 / Spec II.

No resistance, no road feel, no centering force from the game.

The game is playable with wheel controls, but FFB is completely absent.

What I Already Verified

1. The wheel is physically fine.

2. Force feedback works in native PC games on the same Steam Deck setup.

3. new-lg4ff is loaded successfully.

Relevant kernel log output includes:

Force feedback support for Logitech Gaming Wheels (0.5.0)

4. Oversteer profiles apply correctly.

5. The problem occurs even when launching PCSX2 directly, so it does not seem to be caused by EmuDeck or Steam launch options.

Additional Notes

This is on Linux / Steam Deck, but because the wheel and FFB work correctly in other games, I suspect this may be a PCSX2 wheel/FFB issue rather than a general Linux wheel support problem.

The Force Feedback binding showing as SDL-0 may be relevant.

I also tested leaving FFB unbound / rebound and still did not get working FFB in-game.

I also testes turning “ignoring inversion” on and off and “workaround for intermittent FFB loss”, no success in different combinations.

Reproduction Steps

1. Connect Logitech G27 on Steam Deck / Linux.

2. Ensure wheel is working with Oversteer + new-lg4ff.

3. Open PCSX2.

4. Configure USB Port 1 as Wheel Device.

5. Select Driving Force Pro or Driving Force Pro (rev11.02).

6. Map steering, throttle, brake, and force feedback.

7. Launch Gran Turismo 4 / Spec II.

8. Observe that controls work, but FFB does not.

Expected Behavior

Gran Turismo 4 should provide force feedback to the Logitech G27 when configured as a supported wheel device.

Actual Behavior

Wheel input works, but there is no force feedback.

PCSX2 Revision

V2.7.282 nightly

Operating System

Linux (64bit) - Specify distro below

If Linux - Specify Distro

SteamOS

CPU

AMD Zen 2 4-core / 8-thread APU

GPU

AMD RDNA 2 (8 CUs)

GS Settings

Default settings, no major GS changes.
If needed, I can provide screenshots of my graphics settings.

Emulation Settings

GS Window Screenshots

No response

Logs & Dumps

No response

[lucasnrv-a11y]

This may be related to #8612, #11917, and #13932.

My setup is different, but the behavior appears consistent with the same regression family:

• Steam Deck / SteamOS
• Logitech G27
• Oversteer
• new-lg4ff loaded correctly
• wheel input works
• pedals work
• force feedback does not work in GT4 / GT4 Spec II

FFB works correctly in native PC games on the same system (for example ETS2 and BeamNG), so this does not appear to be a general Linux wheel driver issue or a hardware problem with the wheel.

Because of that, this seems more likely to be related to the current PCSX2 USB / wheel / FFB implementation, as described in #8612 and #11917.

It may also be related to #13932, since that report suggests Logitech wheel FFB stopped working correctly from v2.7.27 onward after the SDL 3.4.0 change.

I cannot test the SDL3.dll workaround from #13932 on Linux / SteamOS, but the symptoms are very similar:

• wheel input works
• pedals work
• FFB does not work in GT4 / Spec II