Rumble not working with xbox pad on linux

[Salamandre]

Hi there,
I am using xbox controllers on linux and the rumble function does not work with any of my games.
However, when I use the commande

Code:

$ xboxdrv -R

the rumble works when I press the triggers as expected.
But when I try

Code:

$ fftest /dev/input/event17

I get the output

Code:

Force feedback test program.
HOLD FIRMLY YOUR WHEEL OR JOYSTICK TO PREVENT DAMAGES

Device /dev/input/event17 opened
Features:
  * Absolute axes: X, Y, RX, RY, Gas, Brake, Hat 0 X, Hat 0 Y,
    [1B 06 03 00 00 00 00 00 ]
  * Relative axes:
    [00 00 ]
  * Force feedback effects types:
    Force feedback periodic effects:
    [00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ]
  * Number of simultaneous effects: 0

Uploading effect #0 (Periodic sinusoidal) ... Error:: Function not implemented
Uploading effect #1 (Constant) ... Error: Function not implemented
Uploading effect #2 (Spring) ... Error: Function not implemented
Uploading effect #3 (Damper) ... Error: Function not implemented
Uploading effect #4 (Strong rumble, with heavy motor) ... Error: Function not implemented
Uploading effect #5 (Weak rumble, with light motor) ... Error: Function not implemented
Enter effect number, -1 to exit

I found this post https://forums.dolphin-emu.org/Thread-no-rumble-with-ds4-in-linux
This @logos88 has exactly the same output an seams to say that his problem is solved, but I don't understand how.

Any hint ?