the opengl-es problem with qt

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Hi:

I have some question when enabling opengl-es with Qt on beagleboard; I have compiled the opengl-es and Qt correctly; The test command of the opengl-es also run correctly;

And the content of the file /etc/power.ini is like this:

[default]

WindowSystem=libpvrQWSWSEGL.so

I have write one class GLWidget which inherit from QGLWidget; Also do some draw action in the paintGL();

If I show the glwidget like this:

GLWidget glwidget;

glwidget->showMaximized();

there is no display error;

But when I show like this:

GLWidget glwidget;

glwidget ->show();

It show some vertical lines on the screen;

It means that if it show with fullscreen,there is no problem. Or, it have the display problem mentioned above(show some vertical lines on the screen)

Thanks;