I’ve been trying out the experimental HDR support in GNOME 47 and it seems to be working nicely for a few games with gamescope / xx-color-management-v4 protocol / VK_hdr_layer.
Really neat to see this working!
The issue is that I’m limited by HDMI 2.0 and would need YCbCr422 for 4k 60Hz @ 10 bpc, but I have not found any way to set this. Is this currently supported or is it handled by the graphics driver?
Using 4k 30 Hz everything looks correct but at 60 Hz there’s significant banding. My assumption is that the output is set to RGB which would have a limit of 8 bpc for 4k 60 Hz.
Would be grateful for any help or insight!
Specifications:
Distribution: Fedora 41
GNOME Version: 47
Graphics card: NVIDIA GeForce RTX 3090
Driver version: 565.57.01
Display: HDR10 capable TV via HDMI
Output from drm_info: