Ubuntu 20.04 Dell Inspiron 3000 on-board audio not being detected

Solution 1:

I suggest you try the following (source).

1. Edit /etc/default/grub

   $ sudo nano /etc/default/grub
   

   Find the line starting with GRUB_CMDLINE_LINUX_DEFAULT and append snd_hda_intel.dmic_detect=0.

   (An alternative option snd-intel-dspcfg.dsp_driver=1 was proposed, you may try whatever works.)

2. Update grub configuration with

   $ sudo update-grub
   

3. Reboot

I expect this to work, compare audio specs of the system in the source OP and the present one. It is worth reading the other answers and comments in the same question.

You might be getting the same result with

$ echo "options snd-hda-intel dmic_detect=0" | sudo tee -a /etc/modprobe.d/alsa-base.conf

(or the alternative

$ echo "options snd-intel-dspcfg dsp_driver=1" | sudo tee -a /etc/modprobe.d/alsa-base.conf

as per item 1 above)

If the above doesn't work, further info on your system may help. Please post the exact output of all the commands listed in Only "Dummy output" (sound) in Ubuntu 20.04 after reboot - Broken driver / module (and, to be sure, the commands themselves as you wrote them).

Related:

1. https://bbs.archlinux.org/viewtopic.php?id=251157
2. Ubuntu 19.10 Audio driver issue
3. https://forums.linuxmint.com/viewtopic.php?t=314511
4. No sound in built in speakers just "dummy output" as output device
5. https://bugzilla.kernel.org/show_bug.cgi?id=205959