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> Some info about the HDMI output on the Gemini
Varti
post Dec 28 2017, 09:00 AM
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Hi,

as it stands, the Gemini doesn't have a built-in HDMI connector. It is possible to have a HDMI output via the USB-C port, but only a custom cable provided by Planet Computers can be used. Some users (including myself) have been wondering why a connector hasn't been included in the device, and why generic USB-C-to-HDMI cables can't be used. In case any of you is wondering the same, the user simon5mx has done some research and published some interesting facts on the Indiegogo project's comments page (https://www.indiegogo.com/projects/gemini-p...22374#/comments):

- including a HDMI connector would have been too expensive due to licensing fees: "[the fee] for HDMI manufacturers making fewer than 10,000 units per year is an annual fee of $5,000 with a royalty rate of $1 per unit." Source: https://en.wikipedia.org/wiki/HDMI#Cost https://hdmi.org/manufacturer/terms.aspx

- the reason why generic USB-C-to-HDMI adapters can't be used: "The MT6797 (X20, X25/X27 same family) doesnít include a built-in HDMI interface. The X20 Development Board deploys the built-in DPI interface as the source for the HDMI output. A peripheral Bridge IC (U6502, MT8193) performs this task. So if the motherboard doesnít have a DSI-HDMI Bridge IC then I guess the adaptor cable will need to do it. Perhaps DSI outputs are chip specific and the bridge chip needs to be programmed accordingly; hence a standard usb-c to hdmi adaptor isnít going to do it." Reference: https://github.com/96boards/documentation/b...reUserManual.md

This cable is available only in the Connectivity Pack, in the All In Upgrade pack and in the All In Bundle, and it cannot be ordered separately, though it has been commented by Planet that "Once Gemini officially launches to general retail the cables will be available individually. For now, and for simplicity, we wanted to keep all the cables as part of the Connectivity Kit".

Thanks to simon5mx for the research and to Planet Computers for the clarification.

Varti
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