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[Denilson Sá <denilsonsa@xxxxxxxxx>]

I have the same issue.

Asus X450CA laptop with a single TRRS jack. External headphones work
correctly, but the external microphone does not work at all. Only the
built-in microphone (that hole next to the webcam) is detected. This has
been happening since 13.10 (the first Ubuntu I installed on this laptop,
which was brand-new at that time).

alsamixer shows: Master, Headphone, Speaker, PCM, Mic Boost, Mic Boost,
S/PDIF, Capture, Auto-Mute Mode, Digital.

Interesting that it shows two "Mic Boost" sliders, but there is no
option to switch to the external microphone. The only recording device
is called "Capture".


alsa-info.sh output:
http://www.alsa-project.org/db/?f=3fca8420153cf1b5424b490cf0d58f65224c27c1


Kernel release:    3.19.0-16-generic

 0 [PCH            ]: HDA-Intel - HDA Intel PCH
                      HDA Intel PCH at 0xf7e10000 irq 32

00:1b.0 Audio device: Intel Corporation 7 Series/C210 Series Chipset
Family High Definition Audio Controller (rev 04)

Codec: Realtek ALC270


Other bug reports from other people:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1366639
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1382642
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/212378
https://askubuntu.com/questions/75828/external-microphone-not-working

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https://bugs.launchpad.net/bugs/1359803

Title:
  External mic not being used in combo port

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I'm using Ubuntu 14.04 on my Asus 1015E that only has a combo audio
  port which accepts smartphone type "headsets" (3.5mm TRRS headphones
  with mic on the same wire).

  Ubuntu does not deactivate the built-in mic when I connect my headset.
  It doesn't even use the headset mic and instead keeps picking up audio
  signal from the integrated microphone (that's on my laptop bezel).

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-32-generic 3.13.0-32.57
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  Uname: Linux 3.13.0-32-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  power-inside   4651 F.... pulseaudio
  Date: Thu Aug 21 20:24:20 2014
  HibernationDevice: RESUME=UUID=d0a4bd33-50b7-419e-80da-efc7ad5b1247
  InstallationDate: Installed on 2013-11-08 (286 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: ASUSTeK COMPUTER INC. 1015E
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-32-generic root=UUID=0323822b-7902-4f91-bf79-2a91c47d7df5 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-32-generic N/A
   linux-backports-modules-3.13.0-32-generic  N/A
   linux-firmware                             1.127.5
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-04-18 (124 days ago)
  dmi.bios.date: 03/15/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1015E.303
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: 1015E
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1015E.303:bd03/15/2013:svnASUSTeKCOMPUTERINC.:pn1015E:pvr1.0:rvnASUSTeKCOMPUTERINC.:rn1015E:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.name: 1015E
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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