HDMI Forum rejects AMD's HDMI 2.1 open-source driver

Re:HDMI Forum rejects AMD's HDMI 2.1 open-source driver by arghwhat on Thursday August 29, 2024 @09:10AM (#41390431)

> and lastly there is some trend to PCIe everything in both consumer and server hardware. In the consumer segment it had been somewhat limited to the "luxury" segment, i.e. Thunderbolt. But with USB4 it slowly ends up in more and more places. So who knows PCIe based video might just replace both of them (and go over USB-C)

Thunderbolt/USB4 is not PCIe. It's a transport layer that can run multiple applications at once, sharing bandwidth based on use. This is opposed to USB-C Alternate Mode, where pins are physically reassigned to a specific application, which uses the pins regardless of whether it needs the bandwidth.

PCIe is then one of the supported applications running on top of the transport.

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Re:HDMI Forum rejects AMD's HDMI 2.1 open-source driver by dathinab on Thursday August 29, 2024 @09:38AM (#41390683)

I know, but this isn't relevant for the argument, if anything it's in favor of some future protocol replacing HDMI/DP/USB-C+DP alt while using the USB-C connector.

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Re:HDMI Forum rejects AMD's HDMI 2.1 open-source driver by arghwhat on Thursday August 29, 2024 @10:29AM (#41391189)

I was just pointing out specifically that there is no such thing as PCIe-based video - nor is there any need for that.

Support for USB4/Thunderbolt DP will proliferate, but there is still benefit to a DP altmode as it's free to implement (the host controller just wires its existing DP input lanes directly to the USB-C connector) and allows for super cheap passive adapters.

If USB-C ends up becoming the standard video connector as well, it will most likely be DP altmode as you then only need a cheap USB-C controller to negotiate the mode.

There isn't really any pressure to invent a new protocol. https://xkcd.com/927/

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