Want all-FOSS 120Hz 4K video on Linux, or 5K at 240Hz? Bad news…
For some years, AMD GPU customers running Linux have faced difficulties getting high-definition, high-refresh-rate displays connected over HMDI 2.1 to work correctly. Some posts, such asThe HDMI Forum does not currently allow an open source HDMI 2.1 implementation.
The High-Definition Multimedia Interface is not just a type of port into which to plug your monitor. It's a whole complex specification, of whichMajor motion picture producers including Fox, Universal, Warner Bros, and Disney, and system operators such as DirecTV, EchoStar and CableLabs. With friends like these, as you might expect, HDMI cables are complicated things, including copyright-enforcing measures called High-bandwidth Digital Content Protection – although some of thoseway back in 2010. As we reported when it came out, you needed new cables to get the best out of HDMI 2.1. Since then, that edition was supplemented bySuch high-quality video brings two consequences. On the one hand, the bandwidth the cables are expected to carry has increased substantially.
We've reached out to both the HDMI Forum and to AMD's press office to see if they have anything to add, and if they get back to us, we will update this story. ®, we prefer DisplayPort to HDMI, and one reason is that you can happily drive an HDMI monitor from a DisplayPort output using a cheap cable, or if you have an HDMI cable to hand, an inexpensive adapter. We picked aBut the converse does not hold. You can't drive a DisplayPort screen from an HDMI port.
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