08-30-2019, 12:28 PM
(08-24-2019, 12:41 PM)CampGareth Wrote:(08-24-2019, 10:31 AM)zaius Wrote:(08-19-2019, 12:16 AM)CampGareth Wrote: USB C to HDMI should "just work" if the adapter uses the displayport alternate mode. Some adapters will include a tiny USB GPU and it's those models which won't work on the pinebook Pro.
I'm hoping to get better information soon. The store just reads "USB 3.0 Type-C ports with alt-mode display out". There are five different "alt-mode display" specifications. As far as I can tell, DisplayPort alternate mode requires an adapter with active circuitry, HDMI mode only requires wiring one connector to another.
I think the HDMI alt mode is uncommon, partly due to HDMI's licensing costs and partly due to HDMI being a couple of years late to the party. While wikipedia's list could be incomplete it's pretty damning to see only one device with HDMI alt mode: https://en.wikipedia.org/wiki/List_of_de...over_USB-C
I do agree that the store could be clearer about this, looking around at other RK3399 based dev boards they'll usually clarify what goes over the USB-C port, e.g. "USB-C (USB 3.0 + DP 1.2)"
The USB-C is DP alt mode which is common one. The store has updated with the DP info.
