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Vega 56 4k HDR/pixel format options

Question asked by theagg on Oct 25, 2019

I recently purchased the LG C9 Oled screen and am attempting to run a 4k desktop etc on it (HDMI out from the Vega 56 directly to the screen). I'm aware that HDMI 2.0 should support 4k @60Hz 8bit Full RGB/YCbCr 4:4:4.

 

However, when setting the display resolution to 2160p @ 60Hz in Windows 10, the only options for the colour depth (pixel format) that appear in the Adrenalin drivers is YCbCr 4:2:0. In order to get the full 4:4:4 out, I have to drop the refresh rate to 30Hz or lower, (at which point Adrenalin then gives me full options for Full RGB/YCbCR 4:4:4 formats) 30Hz is not suitable for use though.

 

Is this inability to get those other options to show up in Adrenalin for 4k @60HZ a driver issue or something else ? If so is there a custom workaround to obtain them ?

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