snd_hda default configuration

Alexander Motin mav at
Sat Jan 10 13:49:51 PST 2009

Christian Weisgerber wrote:
> Alexander Motin <mav at> wrote on freebsd-current:
>> You have 3 PCM devices configured:
>> - pcm0: 7.1 playback via 4 rear jacks (Green, Black, Orange and Grey) + 
>> record from mic (front Pink), line (rear Blue), monitor (second mic, 
>> rear Pink), cd (internal Black) or mix (sum of all these).
>> - pcm1: stereo playback via front Green jack.
>> - pcm2: SPDIF output
>> As for me, this configuration is correct and good enough.
> IMO, it would make more sense if pcm1 also had a recording device
> and the front mic was assigned to that.  These modern 7.1+2 codecs
> are really intended to support multistreaming:
> (1) playback (up to 7.1) and recording on the rear panel
> (2) a headset (headphones + mic) on the front panel

Reasonable and popular configuration, but it depends on planned usage 
scenario. You can send proposition to the hardware vendor or use 
loader.conf tunables to override. :)

Alexander Motin

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