Using the Qt SDK 1.1 Beta, create a new QML project with screen rotation permitted.

To the project's .pro file, add

CONFIG += mobility
MOBILITY += multimedia
symbian:TARGET.CAPABILITY += UserEnvironment

In main.qml, write

import QtQuick 1.0
import QtMultimediaKit 1.1

Camera {
}

Launch the application on the N8. The application launches and the camera is active with the camera preview showing on a black background. Now rotate the device to trigger a screen rotation.

Actual result:
The black background disappears and the phone's "desktop" is visible instead.

Expected result:
Black background stays.