I use a Qt5 application with linuxfb. While fbset shows 1366x768, the size of window seems to be 640x480.

fbset shows:

mode "1366x768"
geometry 1366 768 1366 768 32
timings 0 0 0 0 0 0 0
accel true
rgba 8/16,8/8,8/0,0/0
endmode

The application is build from:

main.cpp:
@
#include <QtGui>
#include <QApplication>
#include <QPushButton>
#include "MainWindow.h"

int main(int argc, char **argv) {

QApplication app(argc,argv);

MainWindow mwin;
mwin.show();

return app.exec();
}
@

MainWindow.h:
@
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QPushButton>

class MainWindow : public QMainWindow {

Q_OBJECT

public:
MainWindow();

public slots:
void test();

private:
QPushButton *but=0;
};

#endif
@

MainWindow.cpp:
@
#include <iostream>
#include <QDebug>
#include <QScreen>
#include <QVBoxLayout>
#include "MainWindow.h"

MainWindow::MainWindow() {

    but = new QPushButton("Test");
    connect(but,SIGNAL(clicked()),this,SLOT(close()));
    connect(but,SIGNAL(clicked()),this,SLOT(test()));

    setCentralWidget(but);


    setFixedSize(1366,768);

    showFullScreen();       

}

void MainWindow::test() {

    QRect r = geometry();
    std::cout << r.x() << std::endl;
    std::cout << r.y() << std::endl;
    std::cout << r.width() << std::endl;
    std::cout << r.height() << std::endl;

    std::cout << "test2" << std::endl;

}
@

and run with:

@
./qttest -platform linuxfb:fb=/dev/fb0:size=1366x768 -plugin evdevkeyboard -plugin evdevmouse -plugin evdevtouch
@

The application runs in fullscreen (fills the whole screen) but,
result of cout is:
0
0
640
480

I would expect 1366x768...

Thanks for help and hints.

Strange ... works now...

[edit: added missing coding tags @ SGaist]