Comment 91 for bug 1332900

the objective is to let driver found two speaker node and one headphone so that you have speaker playback volume, bass speaker volume and headphone playback volume for you to determine the subwoofer use which channel (left/right/both)

subwoofer node can be one of the unconnected nodes

sound hdaudioC0D0: autoconfig: line_outs=2 (0x14/subwoofer node/0x0/0x0/0x0) type:speaker
sound hdaudioC0D0: speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)
sound hdaudioC0D0: hp_outs=1 (0x15/0x0/0x0/0x0/0x0)
 sound hdaudioC0D0: mono: mono_out=0x0
sound hdaudioC0D0: inputs:
sound hdaudioC0D0: Mic=0x19
sound hdaudioC0D0: Internal Mic=0x12