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Macbook Pro (9,1) internal microphone not working (CS4206)
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hibajugala
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Joined: 23 Nov 2013
Posts: 6
Location: Ontario, Canada

PostPosted: Wed Dec 10, 2014 7:37 pm    Post subject: Macbook Pro (9,1) internal microphone not working (CS4206) Reply with quote

I recently installed Gentoo on my Macbook Pro 9,1 and it's been a success. Audio work well, except the for the internal microphone.
I am using alsa as my sound server.

I've tried adding in my /etc/modprobe.d/alsa.conf
Code:
options snd-hda-intel model=mbp55

and
Code:
options snd-hda-intel model=imac27


as well as model=auto. These were the only models from /usr/src/linux/Documentation/sound/alsa/HD-Audio-Models.txt for CS4206/4207.

arecord -l gives
Code:
**** List of CAPTURE hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: CS4206 Analog [CS4206 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 1: CS4206 Digital [CS4206 Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0


Here is the Capture section of alsamixer:
http://i.imgur.com/sd5Q99h.png
and the All section:
http://i.imgur.com/xoOzb6V.png

I've fiddled with alsamixer settings and tried enabling and disabling power management on the card.

Kernel (3.18.0-gentoo) config is here http://pastebin.com/c6fMynZu

Thanks a lot in advance.
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