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DisplayPort 2.1b Arriving This Spring With DP80LL Cables
(www.phoronix.com)
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There are projectors with DisplayPort, but HDMI and VGA are more common. Laptops usually use the USB-C DP alt mode to output DisplayPort signals. HDMI requires a separate port. USB-C can output HDMI, but very few devices support it and it will never be updated past HDMI 1.4.