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I tried Ubuntu Vanila, Mate and Kylin (all same version 20.04) still the same. It plays fine with the inbuilt speakers but when a headphone is plugged in there is no audio. In the speaker settings it changes from speaker to headphones but doesn't play. Then reinstalled 19.10 and now audio is fine.

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Try in your terminal

  • sudo apt update && sudo apt install alsamixer
  • run alsamixer in your terminal.
  • press arrow right til you go to HEADPHONES bar.
  • press M to unmute.
  • press up/down to adjust the volume.
  • press Esc to exit alsamixer.
  • run sudo alsactl store in your terminal to store your settings earlier.
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  • 2
    There is no headphones bar in alsamixer, only master and capture. – Subhankar Sarkar Apr 28 '20 at 20:46
  • For me, this fixes it temporarily, but then unplugging and reinserting the 3.5mm speaker it stops working again – blazingkin Apr 28 '20 at 21:49
  • I can get it to work again by changing the profile for "Built-in Audio", cycling from Analog Stereo Input > Analog Stereo Output > Analog Stereo Duplex, and then it works – blazingkin Apr 28 '20 at 21:50
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    It still is not working :( – sgrmshrsm7 Sep 4 '20 at 5:00
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Ubuntu, headphone not muted in 'alsamixer', volume is high, still now sound!

Please try this, if your Ubuntu is using snd hda intel.

  1. Open Terminal (If you don't know where Terminal is, click Show Application in Unity, type Terminal, it should appear, click it open.)

  2. In Terminal type the command, sudo nautilus. Give your password as asked. This should have opened your file browser with access to root filesystem. Look for etc folder.

  3. Inside etc folder, find modprob.d folder.

  4. In modprobe.d find the file alsa-base.cof (or alsa.conf instead, if alsa-base.conf is not there.)

  5. Copy the following two lines and paste as the last two lines in alsa configuration file you have just opened.

options snd-hda-intel model=headset-mode
options snd-hda-intel model=dell-headset-multi
  1. Click 'Save' in alsa or alsa-base.

  2. Restart the system. Plugin your headphone, microphone.

Now Ubuntu should be able to auto-detect headphone and microphone.

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  • Great! This is what helped me get my sound working. – Jethro Cao Feb 28 at 22:09
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20.04 headphones didn't work for me either. BUT after I finished doing another partial upgrade of packages evertyhing worked. Apparently something was missing / upgrade was not completely finished. Now headphones works just like 19.04.

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    After installing 20.04, I've updated the OS and rebooted but still the headphone jack is not working. Any particular package did you install? – Subhankar Sarkar Apr 26 '20 at 19:19
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After installing Ubuntu 20.04 LTS on my new Dell Vostro 3490 (2019) my 3.5 mm audio jack was not working. This is what worked for me:

  1. Make sure Headphones built-in audio is selected in Ubuntu's Sound Settings in the Output panel.
  2. Run alsamixer to unmute the headphone audio (as in @tanhernandez answer):
# alsamixer
  1. Save alsamixer settings:
# sudo alsactl store
  1. Run:
# lsactl restore
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Use pavucontrol and enable the microphone audio (and speaker). If the microphone is disabled the speaker doesn't work.

I don't know why this happens, but the above fixes the problem.

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