On Thu, 25 Mar 2021 12:12:09 -0400 Alex Deucher alexdeucher@gmail.com wrote:

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• dri-devel

I don't think it's currently exposed anywhere.

Alex

On Wed, Mar 24, 2021 at 5:11 AM Werner Sembach wse@tuxedocomputers.com wrote:

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Hello,

is the information which color mode is currently in used for a display (RGB, YCbCr444, or YCbCr420) exposed to user space somewhere?

If no: Where would be the best place to put code to expose it to sysfs?

Hi,

a very good question. Wayland compositors implementing color management will be interested to know this, and even better, to explicitly control this.

See e.g. Color Calibration Auditing System notes in https://gitlab.freedesktop.org/wayland/weston/-/issues/467 .

Thanks, pq

@Alex Deucher thanks for the info.

@pq Related bugtracker tickets for reference: https://gitlab.freedesktop.org/drm/amd/-/issues/476 https://gitlab.freedesktop.org/drm/amd/-/issues/1541 https://gitlab.freedesktop.org/drm/amd/-/issues/1548 I'm coding something up for the last one atm.