If you're a Linux gamer and use an AMD Radeon graphics card, you might be aware that there are all kinds of limitations and bugs when trying to run at high resolutions with high refresh rates, when using the HDMI port. AMD's software engineers had been working on a solution to it all, by implementing parts of the HDMI 2.1 specification into the code, but sadly had to shelve the whole project because the HDMI Forum rejected the project.
The disappointing news was reported by Phoronix, who spotted a brief explanation of the problem by one of AMD's Linux engineers. If you try to run something like a 4K, 120 Hz display on a Radeon RX 6000/7000 series graphics card, via its HDMI ports, you'll run into problems when using Linux. You wouldn't expect this to happen, because AMD clearly advertises HDMI 2.1 support on all those models.
