In Qt 5.15.1, the environment variable QT_QPA_FB_TSLIB=1 is not working consistently.

Alexey_Golubev

I run the program with the -plugin tslib, and both the program and the touchscreen work. The full launch command is

/home/pi/Qt_Projects/kiab/kiab -plugin tslib.

If I write in ~/.profile

export QT_QPA_FB_TSLIB=1

and launch

/home/pi/Qt_Projects/kiab/kiab

,the program works but the touchscreen does not.

chris1058

To fix the touchscreen issue, add these lines to ~/.profile:

export QT_QPA_PLATFORM=linuxfb
export QT_QPA_FB_TSLIB=1
export QT_QPA_GENERIC_PLUGINS=tslib

Then, reload the profile and launch your program:

source ~/.profile
/home/pi/Qt_Projects/kiab/kiab

I hope this information will be helpful for you
Best Regards
Chris Wright