Thank you for your answer @cyperghost !
I have updated the conf file SHARE/system/batocera.conf like this:
But then, the switch and led stop working (the power button work once to power on, the led once, then buttons and led stop working)
I have updated back the conf file (by setting power switch to RETROFLAG). I will try again with the next Batocera version. (will try to try the current RC)
Thanks again for trying to help me.
Have a nice day.