Please try uninstalling 'timidity' and all 'timidity' related packages.
Then reboot.
** Changed in: alsa-driver (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1746585
Title:
[Latitude E6420, IDT 92HD90BXX, Black Headphone Out, Left] No sound at
all
Status in alsa-driver package in Ubuntu:
Incomplete
Bug description:
Speakers and HDMI sound work fine, only headphones not working. I went
through all of the steps on
https://help.ubuntu.com/community/SoundTroubleshootingProcedure
https://help.ubuntu.com/community/SoundTroubleshooting
and
https://wiki.ubuntu.com/DebuggingSoundProblems
and submitted this report with ubuntu-bug -s audio
Some possibly relevant information: This installation of Ubuntu was
originally installed on a Dell Inspiron 15, but I cloned the partition
onto an SSD that I installed on the Latitude 6420. It is the Latitude
that is affected, the headphones work fine on the Inspiron.
Let me know if any more information is required.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.13.0-32.35~16.04.1-generic 4.13.13
Uname: Linux 4.13.0-32-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/pcmC0D0p: rviertel 2881 F...m pulseaudio
/dev/snd/controlC0: rviertel 2881 F.... pulseaudio
rviertel 4589 F.... alsamixer
CurrentDesktop: Unity
Date: Wed Jan 31 12:22:17 2018
InstallationDate: Installed on 2015-04-27 (1009 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64
(20150218.1)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH failed
Symptom_Card: Built-in Audio - HDA Intel PCH
Symptom_DevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/pcmC0D0p: rviertel 2881 F...m pulseaudio
/dev/snd/controlC0: rviertel 2881 F.... pulseaudio
rviertel 4589 F.... alsamixer
/dev/snd/seq: timidity 1191 F.... timidity
Symptom_Jack: Black Headphone Out, Left
Symptom_Type: No sound at all
Title: [Latitude E6420, IDT 92HD90BXX, Black Headphone Out, Left] No sound at
all
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/11/2011
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A06
dmi.board.name: 0K0DNP
dmi.board.vendor: Dell Inc.
dmi.board.version: A02
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvrA06:bd07/11/2011:svnDellInc.:pnLatitudeE6420:pvr01:rvnDellInc.:rn0K0DNP:rvrA02:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E6420
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.
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