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RayDude Advocate
Joined: 29 May 2004 Posts: 2060 Location: San Jose, CA
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Posted: Sat Dec 03, 2022 1:17 am Post subject: Does anyone know how to get RDNA2 to output 4K YCrCb 420? |
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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:
Code: | xrandr --newmode "3840x2160_60" 594.00 3840 4016 4104 4400 2160 2168 2178 2250 +hsync +vsync
xrandr --addmode HDMI-A-0 3840x2160_60
xrandr --output HDMI-A-0 --mode 3840x2160_60 |
However, I need to figure out how to save this since kde plasma has no idea about this mode. It's not listed in the monitor's EDID. _________________ Some day there will only be free software. |
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psycho Guru
Joined: 22 Jun 2007 Posts: 534 Location: New Zealand
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Posted: Sat Dec 03, 2022 10:16 am Post subject: |
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Hi Ray.
In the old days of manual xorg.conf configuration we used to add permanent modelines like this: Code: |
Section "Monitor"
Identifier "HDMI-A-0"
Modeline "3840x2160_60" 594.00 3840 4016 4104 4400 2160 2168 2178 2250 +hsync +vsync
Option "PreferredMode" "3840x2160_60"
EndSection |
Otherwise maybe you could just script your xrandr commands in .xinitrc (or later in .config/autostart) or whatever...? |
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RayDude Advocate
Joined: 29 May 2004 Posts: 2060 Location: San Jose, CA
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Posted: Sat Dec 03, 2022 10:05 pm Post subject: |
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Thanks Psycho.
I created a conf file in /usr/share/X11/xorg.conf.d/
Next time I reboot I'll see if it works. _________________ Some day there will only be free software. |
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