Thanks to your reply to my problems with 18.04 and sound. Just now saw it,
so I am only now replying.

On Wed, Feb 27, 2019 at 4:25 PM Jean-Pierre van Riel <
<email address hidden>> wrote:

> It's a shot in the dark, but in my case, pulse sound server (atop of
> alsa) seems to have gotten into a mess with an upgrade between 16.04 and
> 18.04. Post login, removing old / session start user config fixed my
> dodgy channel mappings (but not quite the same as crackling, etc):
>
> pulseaudio --kill \
>   && rm -r ~/.config/pulse/* \
>   && pulseaudio --start
>
> However, every new boot, the same missing channel mappings cause my
> audio to sound bad (not mapped correctly to 5.1 channels).
>
> Also, try alsa-info which is a script that bundles all the alsa
> inspection commands and then maybe try fish for the problem in that.
> Also try figure out how to play a sound file directly to alsa vs via the
> pulse sound server to rule out pulse causing the problem.
>
> I think the speaker-test command also directly tests the alsa layer
> where as the gnome-control-centre (settings) sound page "Test Speakers"
> tests the setup via pulse.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1790816
>
> Title:
>   Terrible sound after update to 18.04
>
> Status in alsa-driver package in Ubuntu:
>   New
>
> Bug description:
>   The sound just is extremely distorted after update to 18.04. Like an
>   old radio that's not picking up the station right. I saw a webpage
>   about the same device I am using and tried their solution. That didn't
>   help at all. Hope I didn't make things worse.
>
>   I saw a page that mentioned the lspci command. Based on that, I guess
>   I am using an Intel 82801 JD/DO audio card. One site said that
>   requires an snd_hda_intel driver, but all I could find in Synaptic
>   Package Manager was that an alsa driver and pulse audio were
>   installed. Could the correct driver have been removed with the new
>   installation?
>
>   This computer has been kind of buggy as of late, but the audio had
>   been working. I had problems installing this OS. Mostly it seems to be
>   working otherwise though.
>
>   1) Description:       Ubuntu 18.04.1 LTS
>   Release:      18.04
>
>   2) N: Unable to locate package pkgname
>
>   3) What you expected to happen: sound to work properly
>
>   4) What happened instead: sound distorted
>
>   Hope my attempt to fix it doesn't screw up the bug report.
>
>   ProblemType: Bug
>   DistroRelease: Ubuntu 18.04
>   Package: alsa-base 1.0.25+dfsg-0ubuntu5
>   ProcVersionSignature: Ubuntu 4.15.0-33.36-generic 4.15.18
>   Uname: Linux 4.15.0-33-generic x86_64
>   ApportVersion: 2.20.9-0ubuntu7.2
>   Architecture: amd64
>   AudioDevicesInUse:
>    USER        PID ACCESS COMMAND
>    /dev/snd/controlC0:  szettner   2030 F.... pulseaudio
>   CurrentDesktop: GNOME-Flashback:GNOME
>   Date: Wed Sep  5 03:07:08 2018
>   InstallationDate: Installed on 2017-06-28 (433 days ago)
>   InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64
> (20170215.2)
>   PackageArchitecture: all
>   SourcePackage: alsa-driver
>   Symptom: audio
>   Symptom_AlsaPlaybackTest: ALSA playback test through plughw:Intel failed
>   Symptom_Card: Built-in Audio - HDA Intel
>   Symptom_Jack: Green Headphone Out, Front
>   Symptom_Type: High background noise, or volume is too low
>   Title: [OptiPlex 760, Analog Devices AD1984A, Green Headphone Out,
> Front] Background noise or low volume
>   UpgradeStatus: Upgraded to bionic on 2018-09-02 (2 days ago)
>   dmi.bios.date: 12/03/2008
>   dmi.bios.vendor: Dell Inc.
>   dmi.bios.version: A01
>   dmi.board.name: 0D517D
>   dmi.board.vendor: Dell Inc.
>   dmi.board.version: A00
>   dmi.chassis.type: 3
>   dmi.chassis.vendor: Dell Inc.
>   dmi.modalias:
> dmi:bvnDellInc.:bvrA01:bd12/03/2008:svnDellInc.:pnOptiPlex760:pvr:rvnDellInc.:rn0D517D:rvrA00:cvnDellInc.:ct3:cvr:
>   dmi.product.name: OptiPlex 760
>   dmi.sys.vendor: Dell Inc.
>
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>
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>