the capture volume has atten and gain (-16.5db to 30dB)
 
        control.10 {
                iface MIXER
                name 'Capture Volume'
                value.0 0
                value.1 0
                comment {
                        access 'read write'
                        type INTEGER
                        count 2
                        range '0 - 31'
                        dbmin -1650
                        dbmax 3000
                        dbvalue.0 -1650
                        dbvalue.1 -1650
                }
        }

the mic jack has boost volume control but your internal mic did not

Node 0x18 [Pin Complex] wcaps 0x40058f: Stereo Amp-In Amp-Out
  Control: name="Mic Boost Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=0, ofs=0
  Control: name="Mic Jack", index=0, device=0
  Amp-In caps: ofs=0x00, nsteps=0x03, stepsize=0x27, mute=0
  Amp-In vals:  [0x00 0x00]
  Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-Out vals:  [0x80 0x80]
  Pincap 0x00001734: IN OUT Detect
    Vref caps: HIZ 50 GRD 80
  Pin Default 0x03a19830: [Jack] Mic at Ext Left
    Conn = 1/8, Color = Pink
    DefAssociation = 0x3, Sequence = 0x0
  Pin-ctls: 0x24: IN VREF_80
  Unsolicited: tag=02, enabled=1
  Power states:  D0 D1 D2 D3 EPSS
  Power: setting=D0, actual=D0
  Connection: 1
     0x0e


dB range of mic jack is -16.5 to 60 dB 
dB range of internal mic is -16.5 to 30 dB


    0.342|   0.000) D: [pulseaudio] alsa-mixer.c: Available mixer paths (after 
tidying):
(   0.342|   0.000) D: [pulseaudio] alsa-mixer.c: Path Set 0x8472b58, 
direction=2
(   0.342|   0.000) D: [pulseaudio] alsa-mixer.c: Path analog-input-microphone 
(Microphone), direction=2, priority=87, probed=yes, supported=yes, 
has_mute=yes, has_volume=yes, has_dB=yes, min_volume=0, max_volume=3, 
min_dB=-16,5, max_dB=60
(   0.342|   0.000) D: [pulseaudio] alsa-mixer.c: Element Mic Boost, 
direction=2, switch=0, volume=1, volume_limit=-1, enumeration=0, required=0, 
required_any=4, required_absent=0, mask=0x3600000000f66, n_channels=2, 
override_map=yes
(   0.343|   0.000) D: [pulseaudio] alsa-mixer.c: Element Capture, direction=2, 
switch=1, volume=1, volume_limit=-1, enumeration=0, required=0, required_any=0, 
required_absent=0, mask=0x3600000000f66, n_channels=2, override_map=yes
(   0.343|   0.000) D: [pulseaudio] alsa-mixer.c: Jack Mic, alsa_name='Mic 
Jack', detection possible

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to pulseaudio in Ubuntu.
https://bugs.launchpad.net/bugs/1245340

Title:
  Internal michrophone works only in System testing

Status in “pulseaudio” package in Ubuntu:
  Incomplete

Bug description:
  I have Packard Bell Dot S netbook (with internal microphone)

  To reproduce:
  1. Start 'System Testing'
  2. Select 'Audio tests'
  3. During audio test note that you *can* hear yourself (but rather poorly, 
it's internal mic after all)

  4. Go to Sound Settings, Tab->Input
  5. 'Record sound from' is empty, input volume is grayed out.

  6. Start audacity
  7. Press record, speak, press stop
  8. Press play
  9. Nothing is audible

  What i expect to happen:
  If system testing was able to record from the internal mic, i expect other 
systems to be able to do that as well.

  What actually happens:
  System testing is able to perform tasks that other parts of the system are 
unable to do.

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https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1245340/+subscriptions

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