Ryzen 2400 G (Navi 11) & LG 27UD58-B = No 10-bit possible
I cannot get 3840x2160@60hz, YCbCr 4:2:2, 10-bit running. It does not work as opposed to the monitor's specs. Only 8 bit available.
3840x2160@30hz, ycbcr 4:2:2, 10-bit works fine, but 30hz is not really preferable.
GPU-Scaling on or off does not make a difference. I guess that this is a driver-related issue, since 3840x2160@60hz, YCbCr 4:2:2, 10-bit is being supported by the monitor, by the HDMI cable, by the mainboard (HDMI 2.0) and by the APU (Navi 11)