Hi,
it is possible use in a QT application to use 2 display?
I have two 640x480 display and i want use an application with a "user interface" of 1280x480 and I want to see on screen1 dev/fb0 half and half on other screen dev/fb1.
Do you use some kind of window manager? Your Qt application should not need to worry about the physical displays at all, if the window manager can handle multiple monitors accordingly.