Git hub user yjun123 created an issue in Github reporting a bug in the latest update for Pinebook Pro.
The bug report by yjun123 was so well written I will refer you to his report for details.
Actions taken.
The problem was fixed and a new image was released with the fix.
Installs of the new Pinebook Pro image should be OK.
If you have an older installation on the Pinebook Pro and have not updated within the last 3 or 4 days, this should update your system with the proper DRM files.
sudo pacman -Syu libdrm
pacman will report something like:
libdrm conflicts with libdrm-pinebookpro, do you wish to remove libdrm-pinebookpro?
enter y and the update should be completed OK.
Pudge