Hello Qt Experts,

With a touchscreen (Chalkboard Electronics) and under Ubuntu (using Openbox as a window manager), I am unable to display properly my application's window (maximized upon showing):

folog_touchscreen.jpg

The application's window with a normal screen (and another OS) :

folog_normal_screen.jpg

Can someone tell me what's going wrong (dpi issue ?) and how can I fix this issue ?

Below, the output of xrandr :
Screen 0: minimum 8 x 8, current 1366 x 768, maximum 32767 x 32767
HDMI-0 connected primary 1366x768+0+0 (normal left inverted right x axis y axis) 220mm x 120mm
1366x768 60.00*+
1920x1080 60.00
1280x720 60.00 59.94 50.00
1024x768 60.01
800x600 60.32
720x576 50.00
640x480 59.94
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
Thank you very much.