Systemd: systemd 245.5-2
Device can randomly hangs during reboot or shutdown proccess, Power Button pressing 5 seconds only helps here.
Adding to HOOKS array
shutdown hook and refresh kernels.
The work-around for now appears to edit
/etc/mkinitcpio.conf and look for the following line:
HOOKS="base udev autodetect modconf block keyboard keymap filesystems"
shutdown hook like so:
HOOKS="base udev autodetect modconf block keyboard keymap filesystems shutdown"
Afterwards, regenerate the initramfs as follows:
sudo mkinitcpio -P
Upon reboot and a 2nd shutdown, the problem seems to go away. The developers (either archlinux or systemd) might want to check to ensure this is a regression or intended behavior.