# cat /sys/bus/pci/devices/0000:02:00.0/power/control               # GPU
auto

# cat /sys/bus/pci/devices/0000:02:00.0/power/runtime_status        # GPU
active

# cat /sys/bus/pci/devices/0000:02:00.0/power/runtime_usage         # GPU
cat: '/sys/bus/pci/devices/0000:02:00.0/power/runtime_usage': No such file or
directory

# cat /sys/bus/pci/devices/0000:02:00.0/power/runtime_active_kids   # GPU
cat: '/sys/bus/pci/devices/0000:02:00.0/power/runtime_active_kids': No such
file or directory                               

# cat /sys/bus/pci/devices/0000:02:00.1/power/control               # HDA       
auto                                                                            

# cat /sys/bus/pci/devices/0000:02:00.1/power/runtime_status        # HDA
active

# cat /sys/bus/pci/devices/0000:02:00.1/power/runtime_usage         # HDA
cat: '/sys/bus/pci/devices/0000:02:00.1/power/runtime_usage': No such file or
directory

# cat /sys/bus/pci/devices/0000:02:00.1/power/runtime_active_kids   # HDA
cat: '/sys/bus/pci/devices/0000:02:00.1/power/runtime_active_kids': No such
file or directory

# ls -l /sys/bus/pci/devices/0000:02:00.1/driver
lrwxrwxrwx 1 root root 0 Jun 19 18:04 /sys/bus/pci/devices/0000:02:00.1/driver
-> ../../../../bus/pci/drivers/snd_hda_intel