This is what it say here:
https://www.freebsd.org/doc/handbook/x-config.html
Quote:
5.4.6. Monitors
Almost all monitors support the Extended Display Identification Data standard (EDID). Xorg uses EDID to communicate with the monitor and detect the supported resolutions and refresh rates. Then it selects the most appropriate combination of settings to use with that monitor.
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https://man.openbsd.org/xrandr.1
It is not clear what exactly you want to do or are trying to accomplish, so I don't know what more to say.