Quote:
Originally Posted by Poly
The current beta driver is a poor workaround and provides only two inferior options, clone mode and extended (2nd) AirPlay display that is limited to 1080p – a terrible resolution choice for a 4k display.
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you can use an external app to set the resolution of your 4K display. Its not limited to 1080p. Works great on my macbook air with an external fujitsu display.