[Stefan Mileschin]

AMD recently tried to add support for key HDMI 2.1 features like 4K@120 Hz and 5K@240 Hz to their open-source Linux graphics driver called AMDGPU. They invested engineering resources over several months to prototype the necessary code internally before publishing. The goal was to showcase HDMI 2.1 capabilities and get the implementation approved by the HDMI Forum. Unfortunately, the Forum ultimately rejected AMD's request, blocking Linux users of new AMD Radeon GPUs from utilizing those cutting-edge display features over HDMI. In comments, AMD stated: "The HDMI Forum has rejected our proposal unfortunately. At this time an open source HDMI 2.1 implementation is not possible without violating HDMI Forum requirements." This outcome comes as a major disappointment given the time and effort AMD expended aiming to satisfy the Forum's guidelines. The months of work now feel wasted with this outright rejection. As reasoning, the HDMI Forum cited legal and compliance rules around not enabling open-source HDMI 2.1 code.

https://www.techpowerup.com/319797/h...40-hz-on-linux