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by naikrovek 285 days ago
> DP -> HDMI conversion hardware is pretty intense.

It can be, but it doesn't have to be. DisplayPort is mostly a superset of HDMI, with different voltage levels. Going from HDMI to DisplayPort is much harder than going from DisplayPort to HDMI, though the hardware to do this is apparently much cheaper than it used to be, which is nice to see.

DisplayPort to HDMI only requires level shifting, as I understand it. I'm sure someone will correct me if they see this and I'm wrong.
2 comments
manwe150 285 days ago
No, it requires active protocol conversion, https://www.exhibitedge.com/how-to-connect-a-displayport-dev...

But also yes, most display port implementations also speak hdmi and can get away with simple converters

link
arghwhat 284 days ago
This is not true, DisplayPort and HDMI is not compatible, but the dedicated converter chips are quite efficient at their job. One is present inside every USB-C to HDMI cable, dongle or dock, as there is no such thing as USB-C HDMI alt-mode. Heck, even laptop HDMI ports are usually implemented through a DP converter.

You might be thinking of DisplayPort++, which is a special port supporting both DisplayPort and HDMI, allowing passive adapters. This is not available in the USB-C DisplayPort AltMode.

link