Comment # 88 on bug 1201418 from ted chang

 dmesg | grep -i acp5x
[    6.815712] snd_pci_acp5x 0000:04:00.5: enabling device (0000 -> 0002)
[    7.880453] input: acp5x Headset Jack as
/devices/pci0000:00/0000:00:08.1/0000:04:00.5/acp5x_mach.0/sound/card1/input18