I managed to fix it on my own soon after I posted this by figuring out how to rebind the controls on SNES9x2002; I'll share my steps for anyone else needing help with this.

First, load up any SNES rom on the most recent SNES9x LibRetro core. (This core runs crap on a Pi 0, but don't worry.)
Go into the Retroarch menu (Select + A or B, I can't remember) and go to the quick menu.
From the quick menu, go to controls and then rebind all the buttons for the controllers to how you want them.
Then save the core remap file.
Change your emulation core to SNES9x2002, and go back to the same control section in the quick menu.
Select 'Load Remap File" and navigate to the core remap file that was made for the modern SNES9x core and select it.
Finally, save the core remap file for SNES9x2002.

(All because we can't just do the first bit in SNES9x2002 for some reason... A pox upon you, whoever handled porting those old cores)

Oh, and some words to make sure this can be easily found by anyone who needs it:
SNES 9X 2002 remap rebind controls buttons GPi RecalBox PiSNES integer scale not saving sticking options settings

Oui, oui nous sommes d'accord mais je ne le constate pas sur mame, sur la sness je trouve ça par moment génant, dans les deux cas j'ai la même conf

Hi @johnodon

As far as I know, it's not possible to remap keyboard.

Sorry,
David

Hello, I'm having the same issue. Did you find something?
I can also see running sudo btmon that bluetooth events are being received, and they look just like with others gamepad controllers that are currently working fine.

@jrbaka Ici par exemple
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=2ahUKEwiEn9Gxw_PmAhXtyIUKHTSrADIQFjAAegQIAxAB&url=https%3A%2F%2Fgithub.com%2Flibretro%2Fglsl-shaders%2Fblob%2Fmaster%2Fcrt%2Fshaders%2Fcrt-pi.glsl&usg=AOvVaw23gg4_jcLZHRUp002-j0dN
Ensuite, tu suis les instructions dans le lien du forum que je t'ai donné.

Honte à moi !
C'est en général ce que j'essaie toujours en premier !
Effectivement, je suis passé du firmware 1.32 au 1.33 et je peux dorénavant activer mes deux SF30 PRO en bluetooth et le wifi sans lag. Merci pour le petit coup de main 😉
Sur la 6.1 le wifi et le BT de mon NUC ne fonctionnaient pas. Je passais par un dongle USB pour le BT et en filaire pour le lan. La 6.11 résous mon problème.
J'en profite pour saluer l'équipe Recalbox ! Un ÉNORME merci pour tout le travail accompli ! Que du bonheur !

Hi @voljega you are right. With a common usb pad it works fine immediatelly with all these systems.

@paradadf is there any other solution?

@rastax_o no tenes un bluetooth usb para insertarlo y hacer la prueba? El bluetooth de la rpi3 no es de lo mejor y varia de placa a placa en relacion a la experiencia de los usuarios.

@rockaddicted okey, i think the problem has been resolved, dont worry about this account, im gonna to use this account for doesnt make more problems.

ty for your atention

@darkxceed it's the file that ppl want erased when htey accidentally changed some mappings there

@lexx the gamepad is constantly moving of 1/256th, so most emulator that use digital inputs wouldn't notice it

@gorden

Dann bist du wohl nicht so empfindlich, was Input Lag angeht.
Es ist aber defnitiv einer vorhanden 😉

Ich kann allen, die sich für das Thema Input Lag interessieren nur diesen Thread ans Herz legen:
https://forums.libretro.com/t/an-input-lag-investigation/4407

@dragu if you were looking for a CM3 project, here is one !

you know, I never even considered changing the TV mode!!!! Thanks!

@marcdk Dude, I know you can probably guess by yourself that:

we are not Retroarch pros some settings could have been written AFTER recalbox was started we can't keep an eye on every Retroarch commit + every libretro core commit + every emulator commit + every buildroot commit just regarding dispmanx, I'm the one who added it on 4.1 we terribly lack time and/or contributors to do this ground work and yes, we also aim for the "most compatible" configuration in terms of emulation but also arch (pi, odroids anx both x86 share the same RA configuration file)

We're really open to get feedback from users if they are willing to improve anything. But just read our commit log, just check by yourself : hardly any one does.

Now a little earlier in the conversation you asked

So please tell me how to significantly reduce the input lag on recalbox with a raspberry pi. I will measure it and extend the article right away.

@joinski gave you some leads, so go ahead and try it by yourself, measure it, write blog articles if it's your hobby. We both know it will never reach the latency of a modern computer or a dedicated box. But it can be slightly improved, maybe to a point where you can feel "more comfortable" when playing, without ever reaching what a PC can do. Regarding PC, i also remember that some libretro forum member made some measure and sad a windows PC was around 7 FPS of input lag, linux was 1 FPS above.

The input lag investigation says it all, is very complete regarding tests, the way they did it etc ...

Retropie gives a few tricks, despite i'm sceptical about the video max swap chain, i was told to put it to 2 or even 1 by libretro members.

@eightkiller il faut savoir que le gestionnaire de bluetooth garde un peu tout en mémoire, et qu'a faire des allers/retours dans l'appairage, ca ne sert a rien. Genre là je viens de faire 4 appairages successifs sur un pad 8bitdo sans réussir. J'ai fait "oublier les pads" et je retourne pour appairer : tac ca marche direct