I think parse_edid expects raw binary, and
my $raw_edid = pack 'H*', $registry;
will work. There's also check_parsed_edid to alert you, even when (very) suspicious results failed to do so :).
Looking at output, fractional dimensions, in mm, indicate something more involved than simply reading size in whole cm (bytes 21-22), I didn't investigate more closely. Further, I didn't investigate neither (sorry), if, after MainWindow-> scaling(X), anywhere where number for size (meaning 'pixels') is to be used, string such as "N.nm" (N.n mm) would result in identical rendering on screen (let's assume no rounding). That's the whole point of it all, to forget about 'pixels', if I'm reading what you say "re-calculate the size in mm" correctly. I agree, I'd probably won't follow this route, neither (not until all displays are 250 dpi or more).
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