Display capplet monitor rotation names make no sense on devices with a portrait screen
I noticed this on a x86 based tablet with a native portrait screen (800x1280 native resolution).
When the screen is used normally / upright, the "Built-in display" "Orientation" field in the Displays tab says "Landscape" and when I rotate it left/right so that it actually becomes landscape the "Orientation" field says "Portrait Left" / "Portrait Right". I'm not sure if using the Landscape / Portrait names here is a good idea in general, but I guess that is another discussion.
At a minimum the code should recognize that it is running on a native portrait screen and swap the Landscape / Portrait nomenclature to match the reality on such a screen.