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Touch screen does not match resolution

PlexplorerPlexplorer Posts: 3Members ✭✭

Hi there,

I've got 1.8.0 running beautifully on RPI2 using a 5" TFT LCD Touchscreen. All is well, except for the touchscreen system preference located at Preferences > System > Input devices > Enable mouse and Touch Screen support.

(See video) When enabled, my bluetooth mouse trackpad works flawlessly. My touchscreen, however, is limited to and will only respond to the top-left corner of the screen. This gentleman is using what appears to the the Official Raspberry Pi 7" touchscreen and does not replicate my issue. I imagine his setup was entirely plug-and-play.

This device works natively with HDMI (screenshot). Upon first boot (screenshot), the native resolution is incorrect and can be easily fixed (screenshot) by editing /boot/config.txt. The LCD manufacturer offers its own Debian touchscreen drivers involving /etc/xorg.conf and the RPI GPIO pins which, to my understanding, is either excluded from RasPlex or buried in the OS somewhere (/storage/.config, maybe?) Additionally, /etc is readonly in LibreELEC, and I am not confident that uncompressing squashfs and adding my own xorg.conf will work. For reference, touchscreen calibration instructions by the manufacturer say to include these lines in xorg.conf -
Section "InputClass"
Identifier "calibration"
MatchProduct "ADS7846 Touchscreen"
Option "Calibration" "140 3951 261 3998"
Option "SwapAxes" "0"
EndSection

This symptom exists in all three skins - OpenPHT 1.8.0, Aeon Nox 5.4.0, and Plex - Black Edition 17.03.16. At this point, I am convinced there is a simple .conf or similar file to support touchscreen that I need help identifying and editing. The touchscreen very clearly works, just needs proper calibration. IMO, cheap Chinese LCDs + RasPlex + 3D printed case = groundbreaking DIY.

Sincere thanks

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