Is dynamic switching between portrait and landscape mode supported?

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Answer:

Qtopia Phone 2.2.0 has a separate Rotation setting application and a QCop service to handle rotation change requests.

By default Qtopia 4.2 and less does not compile the function QWSDisplay::setTransformation. To enable the QWSDisplay::setTransformation function to be used in a custom Qtopia server configure Qtopia with :
-extra-qtopiacore-config "-D QT_QWS_DYNAMIC_TRANSFORMATION"