@DimaKompot I will try that

I cant help directly, but I have a similar issue. My LCD monitor is in 'normal' orientation however, with the mayflash wii bar mounted horizontally at the top. My crosshairs are constrained to the bottom left quandrant in mame-2003-plus at least. (pi 3B+, latest official retropie build).

so no help but fyi you are not alone! I just came onto the forum to search for the same issue

good luck finding a solution! Everyone here is amazing so hopefully there'll be an answer.

@DimaKompot works great installing the "evdev" python package from source:

sudo apt install python-dev python-pip gcc sudo pip3 install evdev

Thanks for your work, a decent way to calibrate was needed.

Take a look at this recent topic - https://retropie.org.uk/forum/topic/22337/gamepad-calibration-problem/3. If the emulator is using the new evdev api to read/access the gamepad, then jscal doesn't have any effect.

Many thanks for the info on evdev. I thought it wasn't being used since evdev-joystick --l doesn't show anything, but the gamepad was being assigned to /dev/input/eventX

I ended up using this solution:
https://joaorb64.github.io/2018/02/14/Configuring-a-Nintendo-Switch-Pro-Controller-on-Linux.html

Can please anybody share his/her experience?

It was the joystick. I just realized I've only been testing with one controller with many receivers. Problem solved

game mode on. turns off all the post processing stuff that adds input lag