Rendering problems with GraphicsView on QGLWidget on libqt4-maemo5/N900

When running the GraphicsViewBenchmark using QGLWidget on N900, content is only drawn to the top left corner of the screen. The remained is black.

To reproduce: G

et GVB from http://qt.gitorious.org/+qt-performance-test-developers/qt/qt-performance-test-developers-clone
master branch
Under /test/benchmarks/uimodel/GraphicsViewBenchmark
Compile the test in scratchbox against libqt4-maemo5 libraries from extras-devel.
Make sure ENABLE_OPENGL flag is passed to qmake to enable use of QGLWidget.
Run the testmanual program with -opengl parameter.