Hello,
We have a fix with the QGLWidget in the Qt Embedded 4.6 branch. I tested it for OpenGL ES 2.0 and found it to be working great. Example Demos: 2dpainting, hellogl_es2 & texture demo http://qt.nokia.com/doc/4.5/opengl-textures.html in the example folder are working great.
I have updated the wiki article (link below) about How to Build Qt and the gitorious url from where to get the updated qt-e.
http://www.tiexpressdsp.com/index.php/Building_Qt
Please give it a shot and share the results. The bitbake recipe for qt-e will be updated soon to pull in the latest fix.
Regards,
Varun