Comment # 4 on bug 106957 from prg@cooco.de

# cat /sys/bus/pci/devices/0000:02:00.0/power/runtime_usage
1

# cat /sys/bus/pci/devices/0000:02:00.0/power/runtime_active_kids
0

# cat /sys/bus/pci/devices/0000:02:00.1/power/runtime_usage
0

# cat /sys/bus/pci/devices/0000:02:00.1/power/runtime_active_kids
0

# lsof /dev/snd/controlC1

No output. Yes, I did run this as root.