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[Raymond <1365769@xxxxxxxxxxxxxxxxxx>]

>>
>> >
>> > On a machine without fixed connecting audio devices like internal
>> > microphone or internal speaker, and when there is no external audio
>> > devices plugging in, the default source/sink is alsa_input/alsa_output
>> > and there is no input devices/output devices listed in the gnome
>> > sound-setting.

https://launchpadlibrarian.net/184055917/PulseList.txt

Seem line in is active port when all ports are not available
Pulseaudio won't switch away from line in but gnome won't show line in
since it is not plugged

ports:
analog-input-microphone-front: Front Microphone (priority 8500, latency
offset 0 usec, available: no)
properties:
device.icon_name = "audio-input-microphone"
analog-input-microphone-rear: Rear Microphone (priority 8200, latency
offset 0 usec, available: no)
properties:
device.icon_name = "audio-input-microphone"
analog-input-linein: Line In (priority 8100, latency offset 0 usec,
available: no)
properties:

active port: <analog-input-linein>

https://launchpadlibrarian.net/184417469/alsa2.txt

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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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