unset Xft.dpi how?

[Felix Miata]

Can anyone tell me how to globally unset Xft.dpi, particularly on an
installation that does not set Xft.dpi via /etc/X11/Xresources, e.g. on
Linuxmint Cinnamon? Searching Mint 17.2 for config files including string
"Xft.dpi:" is fruitless. The string shows up only in 5 binaries in
/usr/lib/*. Attempts I made to unset it via /etc/X11/Xsession.d/ and
/etc/X11/xinit/ all fail. I tried to find a way reading the xrdb man page,
but if it's in there, it's escaping my recognition. Xft.dpi on some distros
and DEs overrides DisplaySize if set in xorg.conf*, and xrandr -fbmm or -dpi
if set in a startup script, which has a very unfriendly effect on attempting
to configure to maximize usability and accessibility via object sizing
through DPI preconfiguration in X.

cf. https://bugs.mageia.org/show_bug.cgi?id=10457
-- 
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 Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata  ***  http://fm.no-ip.com/