Does anyone know how to get RDNA2 to output 4K YCrCb 420?

[RayDude]

I installed a new (first new GPU in six years!) RX 6650 in my linux media server.

It worked once I got amdgpu radeonsi and radeon into my VIDEO_CARDS string.

But, alas, my TV is HDCP 2.2 and the GPU is only HDCP 2.1, so the only way to use HDMI is to set the color format to YCrCb 420. I did that with the GTX 1050ti I had previously.

I read the EDID for the monitor and it doesn't list 3840X2160 at 60 Hz. Only at 30 Hz. I think that's why the AMDGPU driver is doing 30 Hz.

I think i can buy an DisplayPort to HDMI 2.2 converter and that might work, but I was hoping to avoid buying one.

Any advice would be appreciated.

I found out how to set it by hand with xrandr:

[psycho]

Hi Ray.

In the old days of manual xorg.conf configuration we used to add permanent modelines like this:

[RayDude]

Thanks Psycho.

I created a conf file in /usr/share/X11/xorg.conf.d/

Next time I reboot I'll see if it works.
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