QLineEdit eventFilter (KeyPress/KeyRelease) events with querty keyboard erratic behaviour

A released app on Nokia Store intercepts all keystrokes from a QLineEdit (configured with: ImhNoAutoUpperCase | ImhNoPredictiveText ) throught an eventFilter().
Using a software input panel, all printable and non-printable key strokes are properly intercepted (upper and lower case letters, numbers, arrow keys, command key, return, backspace etc).

Using a hardware querty keyboard, the same eventFilter() does not report printable key() values in the KeyPressEvent. Non printable keys seems to be OK, along with some other keys like ';', '/'.
Using modifiers (CTRL) seems to alter the behaviour, but key() values still seems erratic.

Steps to reproduce the problem:
QWidget mobile application wizard
place a QLabel and a QLineEdit at the MainWindow.

Use the following code.
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent), ui(new Ui::MainWindow)
{
ui->setupUi(this);
ui->lineEdit->installEventFilter(this);
}

MainWindow::~MainWindow()
{
delete ui;
}

bool MainWindow::eventFilter(QObject *, QEvent * e) {
if (e->type() == QEvent::KeyPress)

{ QKeyEvent * qe = static_cast<QKeyEvent*>(e); QString text = (QChar) qe->key(); text += "(" + QString::number(qe->key()) + ")"; ui->label->setText(text); }

return false;
}