Comment 17 for bug 1729736

With the "new PCIe PM stuff", if nouveau is not loaded and something else enabled automatic runtime PM (via powertop, via TLP or manually by writing "auto" to /sys/bus/pci/devices/.../power/control) for the Nvidia PCI devices, then indeed the problematic ACPI methods could be triggered.

Kenneth, can you upload your acpidump?
sudo pacman -S acpidump && sudo acpidump > acpidump.txt

Most likely you are affected by
https://bugzilla.kernel.org/show_bug.cgi?id=156341