Hi all, I recently purchased the Pi 3B+ and the 7" touchscreen to use for a senior design project. After some difficulty, I got everything displaying properly (turns out I put the white ribbon cable in backwards, d'oh), however, the screen is not registering touch inputs at all.
I ran apt-get update, upgrade, and rpi-update.
dmesg | grep -i ft5406 shows that it is being detected properly.
cat /proc/cmdline | grep bcm2708_fb shows the correct width and height.
It is being powered directly via the 2.5 A power supply to its microUSB port, with power to the Pi itself through the USB Power Out port on the display. I also tried reseating the tiny end of the DSI cable, just in case, as I read those can be touchy.
Any help would be greatly appreciated! Thanks!