Simple mixer control 'Channel Mode',0
  Capabilities: enum
  Items: '2ch' '4ch' '6ch'
  Item0: '6ch'


when rear Mic and line in are retasked 


https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound/pci/hda/patch_via.c?id=f1e762ddc8035f803d15f8c524151bf788482ec2


there are five capture sources

stereo mix which the audio mixer 0x17 which is a mix of audio output and
the input sources

Node 0x18 [Audio Selector] wcaps 0x300101: Stereo
  Connection: 5
     0x17 0x24 0x1d 0x1e* 0x21


Node 0x17 [Audio Mixer] wcaps 0x20010b: Stereo Amp-In
  Control: name="Rear Mic Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=2, ofs=0
  Control: name="Rear Mic Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=2, ofs=0
  Control: name="Front Mic Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=4, ofs=0
  Control: name="Front Mic Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=4, ofs=0
  Control: name="Line Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=3, ofs=0
  Control: name="Line Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=3, ofs=0
  Control: name="CD Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=1, ofs=0
  Control: name="CD Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=1, ofs=0
  Amp-In caps: ofs=0x17, nsteps=0x1f, stepsize=0x06, mute=1
  Amp-In vals:  [0x17 0x17] [0x80 0x80] [0x9f 0x9f] [0x9f 0x9f] [0x9e 0x9e] 
[0x17 0x17]
  Connection: 6
     0x10 0x24 0x1d 0x1e 0x21 0x13

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https://bugs.launchpad.net/bugs/1322374

Title:
  [M660SRU, VIA VT1708, Pink Mic, Front] No autoswitch

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