AMD says it has improved its FOSS display drivers for Linux, although the organization that controls the HDMI standard won't let it release them.
AMD BANNED from HDMI 2.1 support on Linux
As discovered by Linux benchmarking outfit Phoronix, AMD is having trouble releasing some versions of open-source drivers it has developed for its GPUs – because, according to the Ryzen processor designer, the HDMI Forum won't allow the code to be released as open source code. . Specifically, we're talking about AMD's FOSS drivers for HDMI 2.1 here.
For a few years, AMD GPU customers running Linux have had difficulty getting high-resolution, high-refresh-rate displays connected over HMDI 2.1 to work properly. Some posts, like this one about a 4K display at 120Hz, or this bug report about a 5K display at 240Hz, show that it's a long-standing problem:
The problem isn't a lack of drivers: AMD has already developed them under its GPU Open initiative. As AMD developer Alex Deucher put it in two separate comments on the Freedesktop.org forum:
