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Valve: HDMI Forum Continues to Block HDMI 2.1 for Linux
(www.heise.de)
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this post was submitted on 10 Dec 2025
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Maybe a dumb question… if I used a DisplayPort to HDMI 2.1 adapter, would I get 4K at 120Hz on the Steam Machine and my LG CX tv?
Depends on the adapter and source. You may find issues when playing HDPC protected content if you buy a low quality adapter.
DisplayPort to HDMI doesn't need an adapter since DP has an alt signal mode with HDMI support.
Although I'm not sure 2.1 signalling is available yet or not.
DP++ HDMI support tells the GPU to output HDMI. If the GPU can't output HDMI 2.1 over an HDMI port, it can't output it over a DisplayPort (as a general rule; you could theoretically wire the DP for a higher standard, but why would you?)