This setup is using the NVIDIA kernel module.
Create /usr/share/X11/xorg.conf.d/20-nvidia.conf:
Section "Monitor" Identifier "<default monitor>" Option "UseEdidDpi" "false" Option "DPI" "88 x 88" Option "DPMS" "off" EndSection Section "Screen" Identifier "nvidia" Device "nvidia" Monitor "<default monitor>" DefaultDepth 24 Option "Stereo" "0" Option "nvidiaXineramaInfoOrder" "eDP-1-0" Option "metamodes" "nvidia-auto-select @1920x1080 +0+0" SubSection "Display" Depth 24 Modes "1920x1080" EndSubSection EndSection
Create /etc/X11/Xsession.d/77set_dpi:
/usr/bin/xrandr --dpi 88
Also set the font DPI in System settings/Appearance/Font/Force fonts DPI.
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