I don’t thing there is linux-aarch64 available in the repo anymore.
To solve DP-Alt mode for users we have decided to maintain linux-pinebookpro until we have dp-alt mode working on linux-5.8
Users can update the system and install linux-pinebookpro and linux-pinebookpro-headers
sudo pacman -Syyu linux-pinebookpro linux-pinebookpro-headers
For those who don’t want to use dp-alt mode can stay on linux-5.8
Thank You.