Xrandr live DPI changes

[Benjamin M. Schwartz]

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Is Xrandr supposed to allow me to alter the nominal DPI and physical
screen size (mm) of a running X server?  I tried to do

xrandr --dpi 200

and the windows repainted themselves but nothing changed.  I tried --fbmm
too.  Either way, xrandr didn't report any change in nominal display size.
 Am I understanding the purpose of this control correctly?

I am running X 1.3.0 on an intel 945 (Thinkpad), so maybe this is a
missing feature that has been implemented in the intervening year?

I would gladly accept a pointer to the Xrandr docs if this feature is in
fact documented.

Thanks,
Ben
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