We don't do anything to disable this tablet driver. We have not heard of the ScreenRotationCPUI (and googling for it produces a googlewhack for this page!).
I expect that the tablet driver has only been tested with the tablet display and any physical outputs from the tablet. When it sees additional displays it does not recognise it disables itself to be safe.
I don't think this is a problem that DisplayLink will be able to fix. HP would need to fix this in their Tablet software to work with additional displays.
Wim
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