Seatd
Seatd is a seat manager and provides user sessions (mostly compositors) with access to input and output devices.
See the seatd documentation for further details.
When using elogind, seatd is not required and viceversa.
Installation
apk add seatd # install seatd rc-update add seatd # configure it to auto-start service seatd start # start it now adduser $USER seat # allow current user to access seatd