It's not obvious how to interpret the output. I pasted it into chatgpt and it thinks I am using "Format: ABGR2101010" for both monitors (only 1 has HDR on) so I don't trust it.
EDIT: See my sibling comment.
Under the Planes section, look for planes that have non-zero "CRTC_ID". Those are the planes that actually get output to your monitor.
Here's what I'm getting on an RTX 4090 / InnoCN 27M2V and Cooler Master Tempest GP27U.
https://imgur.com/a/SCyyZWt
Under the Planes section, look for planes that have non-zero "CRTC_ID". Those are the planes that actually get output to your monitor.
Here's what I'm getting on an RTX 4090 / InnoCN 27M2V and Cooler Master Tempest GP27U.
https://imgur.com/a/SCyyZWt