Qextserial on debian linux and readyRead slot

[zamek42]

Hi All,
I would like to use Qextserial in debian linux with readyRead signal. There is no error on init, but it cannot send signal.
Here is my settings:

mSerialPort = new QextSerialPort("/dev/ttyUSB0", QextSerialPort::EventDriven);
    mSerialPort->setBaudRate(BAUD921600);
    mSerialPort->setDataBits(DATA_8);
    mSerialPort->setStopBits(STOP_1);
    mSerialPort->setParity(PAR_NONE);
    mSerialPort->setFlowControl(FLOW_OFF);
    mSerialPort->setQueryMode(QextSerialPort::EventDriven);
    mSerialPort->setRts(true);
    mSerialPort->setDtr(true);
 
    QObject::connect(mSerialPort, SIGNAL(readyRead()), this, SLOT(dataAvailable()));
    mSerialPort->open(QIODevice::ReadWrite);
    if (!mSerialPort->isOpen())
        log_exception(PacketDriverException, "cannot open %s", "/dev/ttyUSB0");

mSerialPort = new QextSerialPort("/dev/ttyUSB0", QextSerialPort::EventDriven);
    mSerialPort->setBaudRate(BAUD921600);
    mSerialPort->setDataBits(DATA_8);
    mSerialPort->setStopBits(STOP_1);
    mSerialPort->setParity(PAR_NONE);
    mSerialPort->setFlowControl(FLOW_OFF);
    mSerialPort->setQueryMode(QextSerialPort::EventDriven);
    mSerialPort->setRts(true);
    mSerialPort->setDtr(true);

    QObject::connect(mSerialPort, SIGNAL(readyRead()), this, SLOT(dataAvailable()));
    mSerialPort->open(QIODevice::ReadWrite);
    if (!mSerialPort->isOpen())
        log_exception(PacketDriverException, "cannot open %s", "/dev/ttyUSB0");

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I read a post here

http://www.qtcentre.org/threads/1562...th-readyRead()

from 2008, it said I can' t use signal in linux
Is it true?
How can I set to use signals?

thx a lot
Zamek