Comment # 11 on bug 106597 from taijian@posteo.de

$ cat /sys/bus/pci/devices/0000:01:00.0/power/runtime_status
active
$ cat /sys/bus/pci/devices/0000:01:00.0/power/runtime_usage
1
$ cat /sys/bus/pci/devices/0000:01:00.0/power/runtime_active_kids 
0
$ cat /sys/bus/pci/devices/0000:01:00.1/power/runtime_status
active
$ cat /sys/bus/pci/devices/0000:01:00.1/power/runtime_usage
0
$ cat /sys/bus/pci/devices/0000:01:00.1/power/runtime_active_kids
0


All of these are with the 'vanilla' kernel.