[alsa-devel] Realtek HD-A codec ALC262: How to unmute mixer node 0x24 Amp-In for Mic Pin 0x18

Lin, Mengdong mengdong.lin at intel.com
Thu Oct 31 07:17:29 CET 2013


We found when recording on ALC262, the audio mixer node 0x24 mutes the input from Mic Pin node 0x18, so we get silent data.
Would someone please give me some advice to solve this?

Node 0x24 [Audio Mixer] wcaps 0x20010b: Stereo Amp-In
  Amp-In caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-In vals:  [0x80 0x80] [0x80 0x80] [0x00 0x00] [0x80 0x80] [0x80 0x80] [0x80 0x80] [0x80 0x80] [0x80 0x80] [0x80 0x80]
  Connection: 9
     0x18 0x19 0x1a 0x1b 0x1c 0x1d 0x14 0x15 0x0b

I cannot find user-space amixer controls to unmute node 0x18.

The recording data flows from Mic Pin 0x18 -> Mixer 0x24 -> audio input 0x07. The Amp-In value on pin 0x18 (Rear Mic Boost) and input 0x07 (Capture Volume) are okay.


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