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How to set HDMI output format to YCC 420?

qsc-seansummers
Beginner
‎05-16-2025 03:55 PM
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I'm trying to use DRM modetest to set the HDMI output format to YCC 4:2:0, but the i915 driver doesn't seem to have support for it in the latest linux kernel (I'm currently using the 6.6 kernel, but that doesn't have it either).

I added a patch to force the color format (https://lists.freedesktop.org/archives/dri-devel/2024-January/437755.html), but the driver finds something incompatible when I set it to YCC 420 and reverts back to RGB. I did verify my EDID has YCC 420 support.

What's the proper  way to set the output format to YCC 420 (and 422/444)? Is there a set of patches I need to apply to the i915 driver and/or DRM?

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