LCD35-Show touch screen not working

[idzuwan]

Installed using LCD35-Show lite, display are fine but touch screen does not seem to work at all, any howtos for troubleshooting?

Raspberry PI OS Linux raspberrypi 5.10.92-v7+ #1514 SMP Mon Jan 17 17:36:39 GMT 2022 armv7l (Debian Bulleye)

[clayy503]

Same with the LCD 3.2 (b) v4. Installed latest version of Raspian desktop on my 2w and only the screen display works after installing drivers, no touch.

[mcreality23]

Same here with LCD 3.5 B v2. Latest Raspbian Desktop on Pi400.

[mrt2407]

Same with LCD 10.1. Worked for a while but every now and then it isn't working.

[felipebraz]

Same here...

[armandoisaac]

Has anyone been able to make the touch work? I bought the screen to use it with as OctoDash but is worthless without the touch functionality.

[JimJ92120]

got it running on Pi 4B with kernel 6.1 on bullseye and bookworm (Raspberry PI OS 64-bit version) following [waveshare wiki instructions] (https://www.waveshare.com/wiki/3.5inch_RPi_LCD_(C)#Install_the_touch_driver)
(example for C version)

also assuming x-org is used (and not wayland on bookworm)

following must be run with root privilege:

./LCD35C-show

# now
sudo  ./LCD35C-show

then updating (or creating) /usr/share/X11/xorg.conf.d/99-fbdev.conf as mentioned here:
https://forums.raspberrypi.com/viewtopic.php?t=161512#p1048180

...
  # output to LCD screen
  Option "fbdev" "/dev/fb1"

  # or replace with this to output to HDMI instead
  Option "fbdev" "/dev/fb0"
...