[Archlinux] Add acpi=off at GRUB

Edit /etc/default/grub and append your kernel options to the
GRUB_CMDLINE_LINUX_DEFAULT line:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

And then automatically re-generate the grub.cfg file with:

# grub-mkconfig -o /boot/grub/grub.cfg

Reference:

• Kernel parameters