Monitor : BenQ EW3270u
Connection cable : DP 1.4 cable
Radeon Driver 18.10.2
In RGB444 / 4K / 60hz mode , I can't enable 10-bit color depth
The AMD control panel can see the menu for 10 bit option , but select the 10 bit will get back to 8 bit after monitor blink out for a sec
The windows 10 display information show the display mode still in 8 bits
Radeon Driver 17.11.4
In AMD control panel , select the 10 bit option also get back to 8 bit
But , the windows 10 display information show the display mode in 10 bits
Radeon Driver get some problem with 10 bit mode , this issue need to fix
Well, not if we are talking about 4:2:2 where 12bpc is supported in HDMI 2.0 and requires a bandwith of 17.82Gbps. So I am still puzzled why AMD Adrenalin keeps defaulting back to 8bpc when trying to set it to 4K@60hz HDR 4:2:2 12bpc over HDMI.
I'm using mini displayport 1.2 for monitor . Can't get 10bpc with RGB444 but can get 10bpc with YCbCr422. My monitor support 1 billions color but only RGB space so when using YCbCr422 color seem weird The driver is 19.8.2 ... it have been months since i bought Radeon VII and did not get 10bit depth though Radeon VII can and my monitor can Anybody help me with this .... Windows 10 1903, Samsung Space Monitor LS27R75
You might check out this thread: solved. There is a lot in the thread as it spans more than a year's time, but in May 2019 it appears that AMD resolved this issue for many. Maybe you'll find some help reading through it.
Fast forward to Dec 2022, still can't get 4K 60hz 4:4:4 10/12 bit to work with RX 6900 XT using HDMI 2.1 connected to Vizio MQ6. Reverts back to 8bit. Meanwhile Xbox One X works flawless.