So it was working sort of in that I had some sort of script that I’d installed (optimus switching if I recall) that let me switch between the two GPU’s that are in this machine, so if I wanted to use the monitor, if I swtiched to the Nvidia GPU (and rebooted) then I could use the monitor, and then when I wanted to use the laptop by itself (and didn’t need the Nvidia) I could switch back to the AMD GPU (and reboot) it would work power-saving.
Edit: Think it was this GitHub - dglt1/optimus-switch-amd-sddm: WIP optimus-switch for amd/nvidia hybrid laptops using SDDM. that I was using to switch between the two GPU’s
What’s better (and not sure if it’s the 450 drivers, or the 5.8 Kernel) is it does now detect the HDMI port (it didn’t used to see it at all). Appreciate any thoughts.