I'm not sure how well that is solvable. UIDeviceOrientationUnknown is 0. This means, especially for the iPad which hasn't got a gyroscope, that the orientation at this time is simply not know.
Imagine your iPad laying on a table, flat and the user is starting your application: there isn't any means to define that your application is actually running in landscape or portrait, unless you tilt the device accordingly. Hence.. the orientation at startup is always 0 (unknown).
You are casting a UIDeviceOrientation type to a UIInterfaceOrientation type. Device orientations have several different values beyond those of an interface orientation.
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