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Combo jack (headphones and microphone) working only as headphone output.
Microphone is not detected at all when plugged-in.

My exact laptop model is: Dell XPS 15 9530.

I'm on 14.04 LTS, but I dont think its version-related. What more
informations shall I collect and post here?

I have also sent a report via http://www.alsa-project.org/alsa-info.sh.
Would it help if I include one here?

$ lsb_release -rd
Description:    Ubuntu 14.04.1 LTS
Release:        14.04
--- 
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  bartek     2296 F.... pulseaudio
 /dev/snd/controlC0:  bartek     2296 F.... pulseaudio
CurrentDesktop: GNOME
DistroRelease: Ubuntu 14.04
EcryptfsInUse: Yes
InstallationDate: Installed on 2014-08-19 (218 days ago)
InstallationMedia: Ubuntu-GNOME 14.04.1 LTS "Trusty Tahr" - Release amd64 
(20140722.2)
MachineType: Dell Inc. XPS 15 9530
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-36-generic 
root=UUID=a8714bf2-f3fb-4875-bb9e-4354f36a7f66 ro quiet splash nomdmonddf 
nomdmonisw
ProcVersionSignature: Ubuntu 3.13.0-36.63-generic 3.13.11.6
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-36-generic N/A
 linux-backports-modules-3.13.0-36-generic  N/A
 linux-firmware                             1.127.6
Tags:  trusty
Uname: Linux 3.13.0-36-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm bumblebee cdrom dip libvirtd lpadmin plugdev sambashare sudo 
www-data
_MarkForUpload: True
dmi.bios.date: 03/28/2014
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A04
dmi.board.name: XPS 15 9530
dmi.board.vendor: Dell Inc.
dmi.board.version: A04
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: Not Specified
dmi.modalias: 
dmi:bvnDellInc.:bvrA04:bd03/28/2014:svnDellInc.:pnXPS159530:pvrA04:rvnDellInc.:rnXPS159530:rvrA04:cvnDellInc.:ct8:cvrNotSpecified:
dmi.product.name: XPS 15 9530
dmi.product.version: A04
dmi.sys.vendor: Dell Inc.

** Affects: alsa-driver (Ubuntu)
     Importance: Medium
         Status: Confirmed


** Tags: apport-collected bot-comment linux trusty
-- 
Dell XPS 15 - audio combo jack - microphone not working
https://bugs.launchpad.net/bugs/1435421
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