Public bug reported:

With my ASUS X550V laptop with the headset jack (combined headphone and
microphone 4-ring 3.5mm jack) and Ubuntu 14.04.1, microphone is not
detected when attached to the headset jack.

Sound output is working fine through the headset's headphones when connected 
(and in Sound Settings it will switch that one only output's name from Speakers 
to Headphones), but it doesn't catch any sound input from the headset's mic 
while you tap it or speak near it.
There are always 2 choices in Input even when the headset is not connected: 
"Microphone (Built-in Audio)" and "Analog Input (Built-in Audio)" shown as 
input devices, yet my laptop only has a single headset jack.

If you click on any of those 2 to be the chosen input sources they
always behave the same: they pickup sounds/taping/noise through the
integrated mic (a hole next to the webcam), disregarding if the headset
is connected or not.

So, you click "Microphone (Built-in Audio)" and tap next to the webcam -
Input levels jump, tap on headset's mic - Input levels don't move
(normal). You click "Analog Input (Built-in Audio)" and tap next to the
webcam - Input levels jump again (!), tap on headset's mic - Input
levels don't move (strange!).

I have tried with position_fix=1, model=headset-mic (for ALC270) and
with latest DKSM.

alsa-info.sh:
http://www.alsa-project.org/db/?f=371e8933a7c7bdc2780d146fa4e7ecf333fb41e1

Also "ubuntu-bug linux" output is attached.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-35-generic 3.13.0-35.62
ProcVersionSignature: Ubuntu 3.13.0-35.62-generic 3.13.11.6
Uname: Linux 3.13.0-35-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.3
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  velja      2290 F.... pulseaudio
CurrentDesktop: Unity
Date: Mon Sep  8 02:51:41 2014
HibernationDevice: RESUME=UUID=a3fbdff6-a80a-4ef9-84ca-c05570747035
InstallationDate: Installed on 2014-07-27 (42 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
MachineType: ASUSTeK COMPUTER INC. X550VB
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-35-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-35-generic N/A
 linux-backports-modules-3.13.0-35-generic  N/A
 linux-firmware                             1.127.5
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/22/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: X550VB.217
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: X550VB
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.:bvrX550VB.217:bd01/22/2014:svnASUSTeKCOMPUTERINC.:pnX550VB:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX550VB:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.name: X550VB
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug trusty

** Attachment added: "Input tab"
   https://bugs.launchpad.net/bugs/1366639/+attachment/4198176/+files/sound.png

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https://bugs.launchpad.net/bugs/1366639

Title:
  [HDA-Intel - HDA Intel PCH, microphone] Headset microphone not
  recognized

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