HDMI Forum Closing Public Specification Access Is Hurting Open-Source GPU Drivers
With the HDMI specification no longer being public but only to "HDMI Adopters" is complicating the open-source GPU driver support. Even for those that are part of the HDMI Forum like AMD in turn cannot provide an open-source implementation of features covered by the closed spec for in turn potentially and indirectly opening up aspects of it to the public.
This situation seems to be the main blocker for why FreeSync with the open-source AMDGPU Linux kernel driver only works with DisplayPort and not HDMI connections, which persistently has been one of the leading questions with regards to FreeSync Linux support and its current shortcomings.
The current HDMI specification restrictions jeopardize a lot of advanced HDMI functionality for the likes of HDMI 2.1 from being implemented within the open-source graphics drivers.
The X.Org Foundation is petitioning the HDMI Forum to at least allow some HDMI 2.1 specification information to be disclosed publicly so that open-source graphics drivers in turn can (legally) implement the functionality.
Let's hope this works out in 2021... In the mean time, keep this in mind when deciding DisplayPort vs. HDMI preferences!