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[Raymond <1365769@xxxxxxxxxxxxxxxxxx>]

seem you are not using latest alsa driver

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


Simple mixer control 'Input Source',0
  Capabilities: cenum
  Items: 'Front Mic' 'Rear Mic' 'Line'
  Item0: 'Rear Mic'
Simple mixer control 'Input Source',1
  Capabilities: cenum
  Items: 'Front Mic' 'Rear Mic' 'Line'
  Item0: 'Rear Mic'
Simple mixer control 'Loopback Mixing',0
  Capabilities: enum
  Items: 'Disabled' 'Enabled'
  Item0: 'Disabled'


Node 0x1e [Audio Selector] wcaps 0x300501: Stereo
  Power states:  D0 D1 D2 D3
  Power: setting=D0, actual=D0
  Connection: 6
     0x2c 0x2b* 0x2a 0x29 0x28 0x21


most via codecs able to record the playing signal by select stereo mix ( node 0x21) 


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] [0x1f 0x1f] [0x81 0x81] [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


node 0x08 is the audio output

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https://bugs.launchpad.net/bugs/1365769

Title:
  [G41MT-S2P, VIA VT2020, Pink Mic, Rear] No sound at all

Status in “alsa-driver” package in Ubuntu:
  Incomplete

Bug description:
  The problem is that the microphone is not detected after a reboot.  As
  a result, some applications cannot get sound from the microphone.

  The Input tab of the Sound window lists no device.

  I have a workround which is to disconnect and then connect the
  microphone after I have logged in.

  Interestingly, the audacity application can access the microphone when
  the system says that the device does not exist

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.2.0-67.101-generic 3.2.60
  Uname: Linux 3.2.0-67-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  tim        2060 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Fri Sep  5 00:12:39 2014
  InstallationDate: Installed on 2011-07-29 (1133 days ago)
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaRecordingTest: ALSA recording test through plughw:Intel failed
  Symptom_Card: Built-in Audio - HDA Intel
  Symptom_DevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  tim        2060 F.... pulseaudio
  Symptom_Jack: Pink Mic, Rear
  Symptom_Type: No sound at all
  Title: [G41MT-S2P, VIA VT2020, Pink Mic, Rear] No sound at all
  UpgradeStatus: Upgraded to trusty on 2014-08-15 (20 days ago)
  dmi.bios.date: 12/31/2010
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F1
  dmi.board.name: G41MT-S2P
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF1:bd12/31/2010:svnGigabyteTechnologyCo.,Ltd.:pnG41MT-S2P:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnG41MT-S2P:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: G41MT-S2P
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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