Hello,

I am working on an X11 based Qt5 project (-platform xcb) that uses this TFP401 DMI/DVI Decoder w/ AR1100 USB Touch (here: https://www.adafruit.com/products/2219) connected to a Raspberry Pi 3 Model B V1.2 and a 4.3" 480x270 screen.

I have configured the screen to be HID-MOUSE using the AR1000/AR1100 Configuration Utility provided by Microchip (here: http://www.microchip.com/wwwproducts/en/en555168 , first link under Software)

The screen configures correctly; I can plug it into the R-Pi and confirm that the touch screen works like a mouse. I can tap my finger and the cursor is placed underneath my finger, I can drag it around on the desktop and the cursor moves with it and stays accurate.

My problem is that whenever I run my Qt5 application, or any qt application for that matter, the cursor starts behaving erratically. After some searching, I came across a topic that described an identical problem (here: https://forums.adafruit.com/viewtopi...it=Qt5#p356093 ), although the thread died without resolution. I followed the advice given and tried switching from Mouse to Digitizer, but that did not solve my issue.

I'm not sure if the issue lies with my RPi configuration, Qt5, X11, this adafruit device, or something else. Any guidance would be greatly appreciated.

Thanks