seem missing "stereo mix"
Node 0x21 [Audio Mixer] wcaps 0x20050b: Stereo Amp-In
Control: name="Front Mic Playback Volume", index=0, device=0
ControlAmp: chs=3, dir=In, idx=3, ofs=0
Control: name="Front Mic Playback Switch", index=0, device=0
ControlAmp: chs=3, dir=In, idx=3, ofs=0
Control: name="Rear Mic Playback Volume", index=0, device=0
ControlAmp: chs=3, dir=In, idx=1, ofs=0
Control: name="Rear Mic Playback Switch", index=0, device=0
ControlAmp: chs=3, dir=In, idx=1, ofs=0
Control: name="Line Playback Volume", index=0, device=0
ControlAmp: chs=3, dir=In, idx=2, ofs=0
Control: name="Line Playback Switch", index=0, device=0
ControlAmp: chs=3, dir=In, idx=2, ofs=0
Amp-In caps: ofs=0x17, nsteps=0x1f, stepsize=0x05, mute=1
Amp-In vals: [0x80 0x80] [0x82 0x82] [0x0c 0x0c] [0x80 0x80] [0x80 0x80]
Power states: D0 D1 D2 D3
Power: setting=D0, actual=D0
Connection: 5
0x2c 0x2b 0x2a 0x29 0x28
In-driver Connection: 6
0x2c 0x2b 0x2a 0x29 0x28 0x08
you can record from Audio Output node 0x08
https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/plain/Documentation/sound/alsa
/HD-Audio.txt
Hint Strings
~~~~~~~~~~~~
The codec parser have several switches and adjustment knobs for
matching better with the actual codec or device behavior. Many of
them can be adjusted dynamically via "hints" strings as mentioned in
the section above.
- add_stereo_mix_input (bool): add the stereo mix (analog-loopback
mix) to the input mux if available
Early Patching
~~~~~~~~~~~~~~
When CONFIG_SND_HDA_PATCH_LOADER=y is set, you can pass a "patch" as a
firmware file for modifying the HD-audio setup before initializing the
codec. This can work basically like the reconfiguration via sysfs in
the above, but it does it before the first codec configuration.
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https://bugs.launchpad.net/bugs/1241439
Title:
no sound/audio, traps: pulseaudio[25921] trap divide error
ip:7fe46a303a57 sp:7fff825b91d0 error:0 in libavutil.so.51.22.1
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