Ryzen APU with Vega, can't do YCbCr4:4:4 @ 4K60

[VirtualLarry]

I can select RGB Full 4:4:4, at 4K60, using HDMI 4K set to "Enahance" on my UHD TV.

YCbCr 4:4:4 appears in the drop-down list, but if I actually choose it, It then shows 4:2:0, with a commensurate lack of color info. (everything turns drab)

Weird, because I can to YCbCr 4:4:4 using my RX 470/'570.

 

[daveybrat]

I honestly just think it's a driver issue right now Larry. The Ryzen APU Vega drivers still seem to have some bugs and problems. I'd imagine they'll get ironed out very soon.

 

[XavierMace]

What do you have your color depth set to? I believe Raven Ridge can only do 4:4:4 4k60p at 8bpc. I can verify this weekend though.

 

[Despoiler]

What do you have your color depth set to? I believe Raven Ridge can only do 4:4:4 4k60p at 8bpc. I can verify this weekend though.

It's not just Raven Ridge it's literally every piece of HDMI gear because HDMI 2.0 can only do 18gbps. 4:4:4 4k 50/60 @ 8bit is 17.8 gbps.

http://www.acousticfrontiers.com/uhd-101-v2/

 

[VirtualLarry]

I've never been able to select higher than 8bpc, on my Avera 40" UHD TV, at 4K60, on both my NVidia-powered and AMD-powered rigs.

 

[XavierMace]

It's not just Raven Ridge it's literally every piece of HDMI gear because HDMI 2.0 can only do 18gbps. 4:4:4 4k 50/60 @ 8bit is 17.8 gbps.

http://www.acousticfrontiers.com/uhd-101-v2/

I'm aware of the limitations of HDMI, Display Port 1.2 will do 4k60p 4:4:4 with 10 bit color. However, I've seen some stating it doesn't work on Raven Ridge.

 

[Despoiler]

I'm aware of the limitations of HDMI, Display Port 1.2 will do 4k60p 4:4:4 with 10 bit color. However, I've seen some stating it doesn't work on Raven Ridge.

Maybe you should reread the OP. He stated he is using HDMI and it's going to a TV.

 

[XavierMace]

I'm aware of that. HDMI not supporting it doesn't necessarily mean the software doesn't allow you to choose it.

 

[XavierMace]

4K confirmation posted here: https://forums.anandtech.com/threads/build-with-ryzen-2400g-problem.2538548/

Looks to be functioning as expected for me.