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I'm using LXQt vesion 0.16.0 in Xorg.
The resolution of screen is 3840 x 2160.
Libreoffice Writer, Brave Browser, Firefox ESR, and etc. would not honor the LXQt's system font settings.
The default DPI value was 96. I tested higher DPI values and 124 was right size for me.
To set 124 as default DPI in Xorg, I created ~/.Xresources file as below. And then modified Xorg startup script files.
You can test font size of new DPI value by run xrdb command in X terminal application. And then, run an Xorg application to see the effect.
xrdb -merge ~/.Xresources
To see Xresources setting, run 'xrdb -query -all'
$ xrdb -query -all
Xft.dpi: 124
To load the DPI value when Xorg starts up, write the below line before the Xorg Window manager, i.e. LXQt 'exec startlxqt' in this case.
xrdb -merge -I$HOME ~/.Xresources &
~/.Xresources
Xft.dpi: 124
~/.xprofile
IM='uim'
export GTK_IM_MODULE=$IM
export XMODIFIERS='@im=$IM'
export QT_IM_MODULE=$IM
export XIM=$IM
uim-xim &
uim-toolbar-gtk3-systray &
xrdb -merge -I$HOME ~/.Xresources &
~/.xinitrc
#!/bin/sh
. ~/.xprofile
exec startlxqt
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Maybe if you want a more "Debian way" and use automatic X handling provided by Debian, just replace "~/.xprofile" by "~/.xsessionrc" without xrdb line:
~/.xsessionrc
IM='uim'
export GTK_IM_MODULE=$IM
export XMODIFIERS='@im=$IM'
export QT_IM_MODULE=$IM
export XIM=$IM
uim-xim &
uim-toolbar-gtk3-systray & t
and in ~/.xinitrc just
#!/bin/sh
exec /etc/X11/Xsession /usr/bin/startlxqt
and ~/.xsessionrc and xrdb will be automatically read/run.
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