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

[Vex]

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.

[Brad Figg (brad-figg)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Did this issue occur in a previous version of Ubuntu, or is this a new issue?

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v3.17 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.17-rc4-utopic/

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]