Comment 14 for bug 1540372

hi Raymond,

Thanks for pointing all this, but I need your help here:

through you raised points I reached a summary that says , the Codec I have has loopback true

http://orion.lcg.ufrj.br/roma/ALSA.html

http://orion.lcg.ufrj.br/roma/scripts/codecs.txt

from the above link, I realized that my Codec

 cat /proc/asound/Intel/codec#*
Codec: SigmaTel STAC9271D
Address: 2
AFG Function Id: 0x1 (unsol 1)
Vendor Id: 0x83847627
Subsystem Id: 0x80863001
Revision Id: 0x100201

Codec STAC9271D

9271(D)/2(D)/3(D)/4(D) has:
 #DACs = 5
#ADCs = 3
Analog loopback yes
Maximum sampling rate 192000

1 more thing according to Alsa modules
https://www.kernel.org/doc/Documentation/sound/alsa/HD-Audio-Models.txt

STAC9227/9228/9229/927x
=======================
  ref Reference board
  ref-no-jd Reference board without HP/Mic jack detection
  3stack D965 3stack
  5stack D965 5stack + SPDIF
  5stack-no-fp D965 5stack without front panel
  dell-3stack Dell Dimension E520
  dell-bios Fixes with Dell BIOS setup
  dell-bios-amic Fixes with Dell BIOS setup including analog mic
  volknob Fixes with volume-knob widget 0x24
  auto BIOS setup (default)

5stack is allocated to motherboards D965 right?
my motherboard is DP35DP

is this affecting in sound recognition?
what shall I do here?

I didnt get your summary at the end , in your last comment.

What should e done If PCM stream is muted due to loopback enable set to true
as per

https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/tree/Documentation/sound/alsa/HD-Audio-Controls.txt

IDT/Sigmatel codecs
-------------------

* Analog Loopback
  This control enables/disables the analog-loopback circuit. This
  appears only when "loopback" is set to true in a codec hint
  (see HD-Audio.txt). Note that on some codecs the analog-loopback
  and the normal PCM playback are exclusive, i.e. when this is on, you
  won't hear any PCM stream.

Thanks