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linuxqwidgetmultiple-monitorsqt5.3

Setting QWidget fullscreen on multi monitor setup

i have a linux system with 2 monitor outputs (1920x1080). I arranged them to have a desktop size of 1920x2160. Now i wanted to run a Qt Applcation, which starts in full screen mode covering the 1920x2160 desktop. I tried:

QWidget::setFullScreen() -> The QWidget is maximized across 1 monitor
QWidget::setGeometry(0,0,1920,2160) -> The QWidget is also maximized across 1 monitor

Even if i do:

QWidget::move(0,0) & QWidget::resize(1920,2160) -> The QWidget does not exceed the size of the 1 monitor.

But if i move and resize the QWidget manually with the mouse, i can resize it to 1920x2160. I was not able to do that programmatically.
Maybe someone has a hint for me on what i am doing wrong.
Thanks in advance.

Solution

  • Cause of the problem is the window manager. If i started the X server without any window manager, it was possible to call 

    QWidget::setGeometry(...)

    and the window sized itself across all connected displays.
    So i mistakenly assumed that Qt is the problem.