With the latest Olimex buster image, I calibrate by going to applications -> settings -> calibrate touchscreen.
I apply the result by writing
in /etc/X11/xorg.conf.d/99-calibration.conf , then I reboot.
The file is modified but the positions of the tactile "touches" are not.
What am I doing wrong ?
Yes, of course, but I only wanted to know how to use the proposed application.
It might be interesting to open a sub-forum in the "others" forum for hardware problems not related to a particular µP or card.