this post was submitted on 09 Dec 2025
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Okay not publishing the spec is still the same, but something else is new nonetheless.
AMD is an adopter*, they have the spec and they implemented a driver for 2.1 intended to be open sourced in Linux. But they were still blocked from publishing it. For HDMI 1.4 that wasn't an issue yet from what I've found (though it's always hard to search for non-existence). Open source implementations of HDMI 1.4, even in hardware description languages, seem to exist.
*you can search for "ADVANCED MICRO DEVICES" here to confirm for yourself
I may have misread or misunderstood the article, but it seemed as though Steam wanted to open source their 2.1 implementation, which would effectively publish the 2.1 specification. I'm pretty sure their agreements with HDMI Forum and HDMI.org prohibit that.