this post was submitted on 06 Apr 2025
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China launches HDMI and DisplayPort alternative — GPMI boasts up to 192 Gbps bandwidth, 480W power delivery (www.tomshardware.com)
submitted 2 weeks ago by [email protected] to c/[email protected]
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[–] [email protected] 9 points 2 weeks ago (1 children)

Displayport is open and entirely free tho... Only HDMI is closed and fees.

[–] [email protected] 6 points 2 weeks ago

DisplayPort 1.2 and later is very much not an open and free standard. Access to the specification is locked behind an NDA and a VESA membership that costs thousands of dollars annually.

DisplayPort 1.1a is a freely available standard and has enough bandwidth to support a single display at either 1080p/150Hz, 1440p/90Hz, or 4K/30Hz. Any higher than that and it's proprietary. Still, VESA doesn't seem to be as restrictive about its standard as the HDMI Forum, which goes so far as to deliberately prohibit HDMI 2.1 in anything open-source (foss drivers like Nouveau can only work with it if the actual support is handled by closed-source firmware).

VESA's fees are for the membership itself rather than per-device like HDMI's are, but a completely separate organization that's unrelated to the DP standard tries to charge per-device license fees on all DP devices. MPEG LA demands $0.20 per DP device for protection from their patents, which is much higher than the HDMI per-device fee, but the claims that their patents apply at all seems to be disputed.