I think Windows has a feature to configure the subpixel arrangement, what about MacOS? Sure they know about the internal screen, but not the one you plug in.
Don't screens tell the OS about their physical characteristics? At least the native resolution and the physical screen size (or dpi) are available to the OS somehow. I'd guess the sub-pixel arrangement might also be.
That's EDID you're talking about and AFAIK, it doesn't support that. On my android now but if anyone wants to fiddle around with what their screen provides, on Linux there is read-edid and parse-edid to query and interpret the raw data directly. It's not terribly much since it's 256 bytes max iirc.
