QSerialPort Issues after upgrading from QT 5.11 to QT 5.13

  • After upgrading from QT 5.11 to QT 5.13 my serial ports on windows 10 have broken. I can no longer send or receive data in the program i have created or in the terminal example program provided by QT. I have used realterm to verify that serial data is coming in form my device. I am setting up the device in a QObject constructor like this:

    SerialDevice::SerialDevice(QString const &PORTNAME, QObject *parent)
        : QObject(parent), _device(new QSerialPort(PORTNAME))
        QSerialPortInfo info(*_device.get());
       //other values initialized from info here
       QObject::connect(_device.get(), &QSerialPort::readyRead, this, &SerialDevice::dataRead);

    In version 5.11 QSerialPort::readyRead is being emitted and data can be read from the serial port, in 5.13 QSerialPort::readyRead is not being emitted and as a result no data is being read from the serial port. I have attempted reinstalling QT 5.13 and i currently have QT versions 5.11, 5.12 and 5.13 installed on my system.

    Any ideas or suggestions anyone has for what could be causing this problem would be appreciated.


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    Hi @dant,

    that is most likely QTBUG-78086


  • yup looks like it is that bug, thanks guys