Valve: HDMI Forum Continues to Block HDMI 2.1 for Linux
Valve: HDMI Forum Continues to Block HDMI 2.1 for Linux
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Valve: HDMI Forum Continues to Block HDMI 2.1 for Linux

At this time an open source HDMI 2.1 implementation is not possible without running afoul of the HDMI Forum requirements.
The HDMI forum continues to be lame
The lame hdmi vs the super rad displayport
Does HDMI even work over USB C? Is there any reason for it to exist?