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Sometimes it is shown in /var/log/Xorg.0.log (it isn't on my system). Alternatively:
it might be parseable out of the contents of the edid virtual file of the /sys/devices directory for the graphics card, for example /sys/devices/pci0000:00/0000:00:0b.0/0000:01:00.0/drm/card0/card0-VGA-1/edid
there's a package called xresprobe which has a ddcprobe command
I came up with http://paste.debian.net/157153 while figuring out just exactly how much my crt could really do. Turns out, it can do a lot more than the edid says it can, but what you want is the bit that extracts the monitor data given the edid. It should be easy enough to figure.
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