Why does the Radeon-driver keep defaulting back to 8bcp when I try to select 10 or 12bcp in 3840x2160@60Hz / YCbCr4:2:2? 12bcp should be supprted under the HDMI 2.0 specification.
Setup:
Only in YCbCr4:2:0 am I able to set a color depth of more than 8bpc (10 and 12bpc are available).