Very quite microphone

[Kevin Bloom <ktnb%posteo.net@localhost>]

Hi all,

I'm having some trouble with a microphone. If I enable the device in
mixerctl(1) (which is inputs.revlvl) and set all mic levels to the
max, I can barely hear the recorded audio at max speaker volume. Here are my settings:

$ mixerctl -av
outputs.master=120,120 volume delta=3
outputs.master.mute=off  [ off on ]
outputs.master2=120,120 volume delta=3
outputs.master2.mute=off  [ off on ]
inputs.beep=108,108 volume delta=36
inputs.reclvl=255,255 volume delta=3
inputs.reclvl.mute=off  [ off on ]
record.mic=252,252 volume delta=64
record.mic2=252,252 volume delta=64
inputs.reclvl2=0,0 volume delta=64
outputs.dacsel=DAC00,DAC01  { DAC00 DAC01 }
record.source=ADC02,ADC03  { ADC02 ADC03 }

Any ideas what might cause this? This is using a headset jack, not
the internal mic as the internal one doesn't record anything other
than beeps and boops.

More info:

$ audiocfg list
0: [*] audio0 @ hdafg0: Conexant CX20671
       playback: 16, 2ch, 48000Hz
       record:   16, 2ch, 48000Hz
       (PR) slinear_le 16/16, 2ch, { 44100, 48000, 96000 }
       (PR) slinear_le 20/32, 2ch, { 44100, 48000, 96000 }
       (PR) slinear_le 24/32, 2ch, { 44100, 48000, 96000 }
       (  ) ac3 16/16, 2ch, { 44100, 48000, 96000 }
1: [ ] audio1 @ hdafg1: Intel product 2805
       playback: 16, 2ch, 48000Hz
       record:   16, 2ch, 48000Hz
       (P-) slinear_le 16/16, 2ch, { 48000 }
       (P-) slinear_le 16/16, 4ch, { 48000 }
       (P-) slinear_le 16/16, 6ch, { 48000 }
       (P-) slinear_le 16/16, 8ch, { 48000 }
       (PR) slinear_le 16/16, 2ch, 48000-48000Hz


$ cat /var/run/dmesg.boot
...
hdaudio0 at pci0 dev 27 function 0: HD Audio Controller
hdaudio0: interrupting at msi1 vec 0
hdaudio0: HDA ver. 1.0, OSS 4, ISS 4, BSS 0, SDO 1, 64-bit
hdafg0 at hdaudio0: Conexant CX20671
hdafg0: DAC00 2ch: Speaker [Built-In]
hdafg0: DAC01 2ch: HP Out [Jack]
hdafg0: ADC02 2ch: Mic In [Jack]
hdafg0: ADC03 2ch: Mic In [Built-In]
hdafg0: 2ch/2ch 44100Hz 48000Hz 96000Hz PCM16 PCM20 PCM24 AC3
audio0 at hdafg0: playback, capture, full duplex, independent
audio0: slinear_le:16 2ch 48000Hz, blk 1920 bytes (10ms) for playback
audio0: slinear_le:16 2ch 48000Hz, blk 1920 bytes (10ms) for recording
spkr1 at audio0: PC Speaker (synthesized)
wsbell at spkr1 not configured
hdafg1 at hdaudio0: Intel product 2805
hdafg1: DP00 8ch: Digital Out [Jack]
hdafg1: DP01 8ch: Digital Out [Jack]
hdafg1: DP02 8ch: Digital Out [Jack]
hdafg1: 8ch/0ch 48000Hz PCM16*
audio1 at hdafg1: playback, capture, full duplex, independent
audio1: slinear_le:16 2ch 48000Hz, blk 1920 bytes (10ms) for playback
audio1: slinear_le:16 2ch 48000Hz, blk 1920 bytes (10ms) for recording
...