unset Xft.dpi how?

[Felix Miata]

Hacksign composed on 2015-10-12 10:03 (UTC+0800):

> If your distribution still use Xorg, then config it via 
> /etc/X11/xorg.conf or any equal config file.
> The keyword is DisplaySize this keyword should be supported by all video 
> card drivers.

This is true at least for Intel, AMD and NVidia gfxchip drivers. Xrandr can
usually produce a comparable result. One or the other may be required instead
to work around bugs[1]. But, Xft.dpi overrides the Xorg computed result for
all modern apps, and many that aren't so modern. My problem is how to unset
Xft.dpi, allowing the X server calculation to affect all X apps. Apparently
this may be impossible in Cinnamon, as it apparently is in Gnome.

[1] https://bugs.freedesktop.org/show_bug.cgi?id=39949
https://bugs.freedesktop.org/show_bug.cgi?id=77321
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