//sys/devices/pci0000:00/0000:00:07.0/subsystem/devices/0000:00:18.5/driver/0000:00:17.1/bus/devices/0000:00:16.7/driver/0000:00:17.0/driver/0000:00:15.1/driver/0000:00:16.4/driver/0000:00:18.1/0000:00:18.1:pcie02/power/state