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QXcbConnection: XCB error: 8 (BadMatch)



  • Hello,

    i have compiled my project on a machine running Debian Stretch and out of a sudden get many of these errors:

    QXcbConnection: XCB error: 8 (BadMatch), sequence: 2409, resource id: 117440720, major code: 130 (Unknown), minor code: 3
    QXcbConnection: XCB error: 8 (BadMatch), sequence: 2429, resource id: 117440720, major code: 130 (Unknown), minor code: 3
    QXcbConnection: XCB error: 8 (BadMatch), sequence: 2432, resource id: 117440720, major code: 130 (Unknown), minor code: 3
    

    What is this? (it doesn't seem to cause any problems, but still it can't be good to ignore it)
    On Windows 7 as well as on another machine running Kubuntu they don't appear.


  • Lifetime Qt Champion

    Hi,

    Are you running your OS on a physical machine or a virtual machine ?



  • Hi,
    it's a physical maschine


  • Lifetime Qt Champion

    What desktop environment are you using ?
    What window manager ?



  • Hi,

    the desktop environment is KDE with kwin as window manager.
    KDE version is 5:92
    kwin version is 4:5.8.6-1


  • Lifetime Qt Champion

    Are you using the distribution provided Qt ?



  • @SGaist yes its the distribution Qt version.

    i'm not sure if it has something to do with this, but i noticed, that i get some compiler warning about VTK:
    VTK version is VTK-8.1.0

    warning: 'QVTKWidget::QVTKWidget(QWidget*, Qt::WindowFlags)' is deprecated [-Wdeprecated-declarations]
    

    or maybe you can tell me what the error means because i have absolutely no idea where to search for


  • Lifetime Qt Champion

    That's not an error, it's just a warning that you are using a method that is considered deprecated and you should consider updating your code.


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