Hi Hui,

Running the command before plugging in headphone didn't work.
So I plugged in, choose as Headphone and then run the command - $ amixer
sset 'Input Source' "Headset Mic"
and it did worked. I can now hear the sound, but only till the time I
didn't plug out and plug in again. So clearly it is not a solution at all.
Though I am not much troubled by this, but fixing this issue will be
beneficial for other users particularly new Ubuntu users.

And there is nothing weird that you can record audio with a pure headphone.
This feature was already in previous Ubuntu versions and Windows also.
Its quite cool and fun. I would be glad if you try this.

Thank you for your response. I just learned a few new tricks with terminal.

Thanks and Regards,
Anubhav Mishra

On Sun, Apr 26, 2020 at 8:32 PM Hui Wang <email address hidden> wrote:

> It is weird that you could record sound with a pure headphone, I have no
> idea how that happened.
>
> And could you please test:
>
> run amixer sset 'Input Source' "Headset Mic" or "Rear Mic" or "Line" first,
> then plug in the headphone and choose headphone, does the sound output
> from headphone?
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1875032
>
> Title:
>   [Vostro 3470, Realtek ALC891, Black Headphone Out, Front] No sound at
>   all
>
> Status in alsa-driver package in Ubuntu:
>   New
>
> Bug description:
>   This problem only occurs when I plug my headphone and choose Headphone
> in option.
>   If I choose Headset, though plugging either headphone or headset, it
> works perfectly.
>
>   ProblemType: Bug
>   DistroRelease: Ubuntu 20.04
>   Package: alsa-base 1.0.25+dfsg-0ubuntu5
>   ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
>   Uname: Linux 5.4.0-26-generic x86_64
>   ApportVersion: 2.20.11-0ubuntu27
>   Architecture: amd64
>   AudioDevicesInUse:
>    USER        PID ACCESS COMMAND
>    /dev/snd/controlC0:  prm        1856 F.... pulseaudio
>   CasperMD5CheckResult: skip
>   CurrentDesktop: ubuntu:GNOME
>   Date: Sat Apr 25 20:05:01 2020
>   DistributionChannelDescriptor:
>    # This is a distribution channel descriptor
>    # For more information see
> http://wiki.ubuntu.com/DistributionChannelDescriptor
>    canonical-oem-somerville-xenial-amd64-osp1-20171027-1
>   InstallationDate: Installed on 2018-09-28 (575 days ago)
>   InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary
> 20171027-10:57
>   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/controlC0:  prm        1856 F.... pulseaudio
>   Symptom_Jack: Black Headphone Out, Front
>   Symptom_Type: No sound at all
>   Title: [Vostro 3470, Realtek ALC891, Black Headphone Out, Front] No
> sound at all
>   UpgradeStatus: Upgraded to focal on 2020-04-24 (0 days ago)
>   dmi.bios.date: 05/29/2019
>   dmi.bios.vendor: Dell Inc.
>   dmi.bios.version: 2.13.0
>   dmi.board.name: 03NJH0
>   dmi.board.vendor: Dell Inc.
>   dmi.board.version: A01
>   dmi.chassis.type: 3
>   dmi.chassis.vendor: Dell Inc.
>   dmi.modalias:
> dmi:bvnDellInc.:bvr2.13.0:bd05/29/2019:svnDellInc.:pnVostro3470:pvr:rvnDellInc.:rn03NJH0:rvrA01:cvnDellInc.:ct3:cvr:
>   dmi.product.family: Vostro
>   dmi.product.name: Vostro 3470
>   dmi.product.sku: 0869
>   dmi.sys.vendor: Dell Inc.
>
> To manage notifications about this bug go to:
>
> https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1875032/+subscriptions
>