Native Build von Qt5 on Raspberry Pi 3 errors: Unable to query physical screen size, defaulting to 100 dpi. To override, set QT_QPA_EGLFS_PHYSICAL_WIDTH and QT_QPA_EGLFS_PHYSICAL_HEIGHT (in millimeters).



  • Hello everyone,
    I have created a GUI (with QtDesigner (Qt5) as external tool of PyCharm), and want to run on my Raspberry Pi 3. I've used this guide link text

    I get this error message:

    Unable to query physical screen size, defaulting to 100 dpi.
    To override, set QT_QPA_EGLFS_PHYSICAL_WIDTH and QT_QPA_EGLFS_PHYSICAL_HEIGHT (in millimeters).

    In my "output" file I have "FontConfig ............. No" instead of "FontConfig ............. Yes",

    I also have at

            pi@raspberrypi~/opt/qt5$ which qmake      
                          /usr/bin/qmake
    

    instead of

            pi@raspberrypi~/opt/qt5$ which qmake
                         /usr/local/qt5/bin/qmake
    

    I also have a full-screen GUI on my Raspberry Pi without font-text, although I did exactly the same.

    I need help please


  • Lifetime Qt Champion

    @Tk25

    Hi
    Did you try to set the QT_QPA_EGLFS_PHYSICAL_WIDTH etc?

    http://stackoverflow.com/questions/18518280/raspberry-pi-qt5-set-physical-screen-size



  • @mrjj
    Hi
    thx for your reply, yes i try to set all QT_QPA_EGLFS_PHYSICAL_WIDTH = 194, QT_QPA_EGLFS_PHYSICAL_HEIGHT= 110
    QT_QPA_EGLFS_DEPTH= 20 (all im mm for 7" Touchscreem Display). But i'm still having the same problems.

    Does anyone have any other suggestions?


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