Persistent configuration

libinput does not store configuration options, it is up to the caller to manage these. Under Wayland configuration is restored by the desktop environment. Under X xf86-input-libinput reads the xorg config files and applies the options [4]. To make changes persistent under X create a file like this:

/etc/X11/xorg.conf.d/99-libinput-custom-config.conf

Section "InputClass"
  Identifier "<something to identify this snippet>"
  MatchDriver "libinput"
  MatchProduct "<substring of the device name>"
  Option "AccelSpeed" "<e.g. 0.3>"
EndSection