I’m just starting investigation why PiTFT capacitive touchscreen used to work with libsdl-1.2.15-5, but doesn’t work with anything newer including libsdl2. Actually it works, but gives crazy jumping results. Please share any info you might have - I’m starting completely from scratch.
Reference link: https://learn.adafruit.com/adafruit-pitft-28-inch-resistive-touchscreen-display-raspberry-pi/pitft-pygame-tips