alt Hacker NewsI’ve been looking for a DisplayPort to HDMI cable to get around this on our household couch gaming computer. I have been unable to find one sketchy or otherwise that can handle high refresh rate and 4:4:4 color.
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FWIW, most USB docks are effectively this. DP goes in via USB-C and HDMI comes out the other end.
I bought one from UGREEN on Amazon. I think it's called the 9 in 1. It does 4k@60 with HDR, coming out of SteamOS.
I usually go for Cable Matters cables, they tend to be of a decent quality and follow the specs well. UGREEN is supposedly a reliable option too, though I cannot personally vouch as I haven't used their cables in particular.
VMM7100 based devices like the Cable Matters 102101 work. Also allegedly CH7218 based adapters. https://gitlab.freedesktop.org/drm/amd/-/issues/4773
According to the article, these adapters generally don't support VRR.
https://www.club-3d.com/shop/cac-1088-1223 (https://geizhals.eu/club-3d-aktiver-adapter-cac-1088-a331004...)
https://www.club-3d.com/shop/cac-1087-1128 (3m cable version)
DP 1.4 → HDMI 2.1. Apparently they're no longer being manufactured (?? - not sure that's correct), so get one while it's still possible...
[Ed.: accidentally linked another adapter that is the other direction. Added 3m & direct manufacturer links.]