[pulseaudio-discuss] usb headset microphone will not work with pulseaudio

[Raymond Yau]

> >
> The alsa-info.sh log from the mac mini (the usb headset will not stay
connected on the dell e6220 long enough for it to work) is at:
>
> http://www.alsa-project.org/db/?f=5e7f45089ce82985c003fa2608bed82726ebbdf6

you need to find out the usb problem in system log of your e6220

how many audio jacks do your macmini have ?

seem only line in support jack detect, internal mic support balanced but
ext mic does not support jack detect

Node 0x0c [Pin Complex] wcaps 0x41048b: Stereo Amp-In
  Control: name="Line Capture Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=0, ofs=0
  Amp-In caps: ofs=0x00, nsteps=0x03, stepsize=0x27, mute=0
  Amp-In vals:  [0x00 0x00]
  Pincap 0x00000024: IN Detect
  Pin Default 0x018b3020: [Jack] Line In at Ext Rear
    Conn = Comb, Color = Blue
    DefAssociation = 0x2, Sequence = 0x0
  Pin-ctls: 0x20: IN
  Unsolicited: tag=00, enabled=0
  Power states:  D0 D3 EPSS
  Power: setting=D0, actual=D0
  Delay: 1 samples
Node 0x0d [Pin Complex] wcaps 0x41048b: Stereo Amp-In
  Control: name="Internal Mic Capture Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=0, ofs=0
  Amp-In caps: ofs=0x00, nsteps=0x03, stepsize=0x27, mute=0
  Amp-In vals:  [0x00 0x00]
  Pincap 0x00001764: IN Detect Balanced
    Vref caps: HIZ 50 GRD 80
  Pin Default 0x90a00110: [Fixed] Mic at Int N/A
    Conn = Unknown, Color = Unknown
    DefAssociation = 0x1, Sequence = 0x0
    Misc = NO_PRESENCE
  Pin-ctls: 0x24: IN VREF_80
  Unsolicited: tag=00, enabled=0
  Power states:  D0 D3 EPSS
  Power: setting=D0, actual=D0
  Delay: 1 samples

Node 0x12 [Pin Complex] wcaps 0x41000b: Stereo Amp-In
  Control: name="Mic Capture Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=0, ofs=0
  Amp-In caps: ofs=0x00, nsteps=0x02, stepsize=0x27, mute=0
  Amp-In vals:  [0x00 0x00]
  Pincap 0x00000020: IN
  Pin Default 0x01ab9070: [Jack] Mic at Ext Rear
    Conn = Comb, Color = Pink
    DefAssociation = 0x7, Sequence = 0x0
  Pin-ctls: 0x20: IN
  Delay: 1 samples

http://mailman.alsa-project.org/pipermail/alsa-devel/2012-March/050186.html

what is the exact meaning of balanced mode ?

7.3.3.16 EAPD/BTL Enable

BTL controls the output configuration of a Pin Widget which has indicated
support for balanced I/O (bit 6, Pin Capabilities Parameter).  When this
bit is 0, the output drivers are configured in normal, single-ended mode;
when this bit is 1, they are configured in balanced mode.  Note that in
balanced mode, the Pin Widget has twice as many pins as it does in normal
mode; i.e., a stereo Pin Widget in balanced mode has four signal pins (in
addition to Vref pins).  However, in both modes it must appear to software
as a single Pin Widget.  The additional pins must be reserved to this
purpose; thus, in a configuration supporting BTL outputs the additional
pins may not be enumerated as a separate Pin Widget.
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