- Sep 22, 2011
- HP EliteDesk 800 G5 Mini
- UHD 630
- Mobile Phone
I've had similar experience with passive usb-c to hdmi cables. If UHD630 igpu is running the port, it works in Windows but not in OSX.After digging some more, I think the not working DP -> HDMI cable may be caused by the cable not including an active DP -> HDMI2.0/1.4 converter which may be required for correct handling by macOS (it does work on Windows though).
The Flex IO HDMI (400/600/800) port is a 2.0a port which isn't supported natively by Coffee Lake (it only does HDMI 1.4), so it most likely has a LSPCON chip on board, which needs to be taken into account when configuring the ports.
I'll play around with it and report back if I find something useful.
I'm using one of these with success in Big Sur.I suppose the best thing you can do for HDMI connectivity is using an active DP 1.2 -> HDMI 2.0a cable or adapter (so no HDR but HDCP 2.2 - not relevant for BigSure but still nice to have when dual booting) and avoiding native HDMI ports alltogether. If I come around buying an active adapter or cable I'll report back my findings.
Good to know about another working active adapter. Readers of this should note there is a lower cost HDMI 1.4a version of this Benfei adapter. https://www.amazon.com/dp/B07D59919H/?tag=tonymacx86com-20I've now got myself this one and it works as intended (only tested 1080p60):