Someone

 grep -i dpi  /var/log/Xorg.0.log
        /usr/share/fonts/X11/100dpi/:unscaled,
        /usr/share/fonts/X11/75dpi/:unscaled,
        /usr/share/fonts/X11/100dpi,
        /usr/share/fonts/X11/75dpi,
(**) VIA(0): DPI set to (89, 100)

xdpyinfo | grep resolution
  resolution:    89x88 dots per inch

_________________________________________

echo "backup xfce4-xft-xrdb font rendering system"
mv ~/.config/xfce4/Xft.xrdb ~/.config/xfce4/Xft.xrdb.backup

echo "setup xfce4-xft-xrdb font rendering system"
echo "Xft.antialias: 1" >> ~/.config/xfce4/Xft.xrdb
echo "Xft.hinting: 1" >> ~/.config/xfce4/Xft.xrdb
echo "Xft.hintstyle: hintfull" >> ~/.config/xfce4/Xft.xrdb
echo "Xft.rgba: rgb" >> ~/.config/xfce4/Xft.xrdb
echo "Xft.dpi: 96" >> ~/.config/xfce4/Xft.xrdb

echo "done and exiting, please restart all application"

exit