xvYCC has the same effective primaries as rec.709, but has a goofy wider gamut that is allowed by letting the Cb Cr coefficients use the 0-16, 240-255 that effectively create negative RGB values.
I wouldn't worry about calibrating for xvYCC, there are no patterns for correctly calibrating it. The gamut is not uniform (the maximum saturation is highly dependent on luminance). It's just a bit of an oddball. Good idea, not actual implementation of it.
The DCI spec uses the P3 gamut as a minimum requirement. Since it encodes color in XYZ technically it can encode all color.
Also, you don't use xvYcc just by turning it on. You can turn it on all you want but you'll get NOTHING different than d65/Rec709 because xvYcc information has to be encoded in the video stream for it to do anything. I've heard rumors that there were some computer games released that used xvYcc, but there's no other consumer content released that uses xvYcc. Some digital video cameras supported xvYcc but you'd have to create your own content with one of those digital video cameras in order to use xvYcc at home (aside from the computer games... if they actually exist).
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