Sound not working Focal Fossa Ubuntu 20.04

The Temporary fix I found(Worked for me and all my friends).

Suspend your system then start again. Now the sound will work.

What worked for me immediately after all was

pulseaudio --start
sudo apt-get install pavucontrol

from https://www.maketecheasier.com/fix-no-sound-issue-ubuntu/

with no changes to the files in /etc/modprobe.d/

This is silly but After days of searching, upgrading from 18.04 to 20.04 then installing fresh 20.04 it still not solved, which finally got solved by just

go to BIOS -> disable Internal Speakers -> apply changes -> Enable again -> Apply changes -> Exit. 

Voila Problem is solved :) :) (Dell Latitude 3510)

Finally, after surfing a lot through the net and reading about options of alsa for NVIDIA aound controller I got the following solution

2 files are to be changed

1. /etc/modprobe.d/alsa-base.conf
2. /etc/modprobe.d/blacklist.conf

Changes in File 1.

• open the file using root
• add the following line to the bottom of the file options snd-hda-intel dmic_detect=0
• save and exit the file

Changes in File 2.

• open the file using root
• add the following to the bottom of the line blacklist snd_soc_skl
• save and exit the file.

Reboot and Enjoy with the restored sound!

I had the same issues. I would get no audio output, except for when I plugged an HDMI in which case I could redirect the sound to the HDMI device. I've tried all the previous answer and it didn't work for my case I have a Dell inspiron 9510 and had ubuntu 20.04 freshly installed.

I made all the different changes in the files

/etc/modprobe.d/blacklist.conf 
/etc/modprobe.d/alsa-base.conf

this never worked for me. I've tried a lot of things, disable internal speakers in BIOS and such, still nothing. I've spent hours trying to fix this. Finally I found this: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1895422 and this: https://www.reddit.com/r/Dell/comments/husu3r/how_to_get_fully_working_audio_in_ubuntu_2004_on/

Basically what you got to do is to allow focal-proposed updates first:

Software & Updates > "Developer options" tab > check "pre-released updates" box.

From here you can already do a

sudo apt update && apt upgrade

Then you can install the linux-oem-20.04

sudo apt install linux-oem-20.04

This will install a new kernel (5.6.0-1036-oem) where sound as proper support apparently. Now just reboot you system and you should be good to go.

You can find more info on this on the links provided. Also the second link has additional steps but for me only the first one worked like a charm !

I hope this can help anyone here who is running into the same issue. If anyone has found another way I'd be also glad to hear it since using a linux-oem is not a completely satisfying method.

SOLVED!, following RolandBBerlin at: https://forum.ubuntu-fr.org/viewtopic.php?id=2055691 I just installed an Acer Swift 3 (SF314-57) and encountered the same problem. This solved the Audio problems:

**Edit the file /etc/modprobe.d/alsa-base.conf** and add the following lines:

**options snd-hda-intel dmic_detect=0
options snd-hda-intel model=laptop-amic enable=yes**

The first line is to enable the speaker, the second for the internal microphone.

Works after rebooting

In case if you don't have any output and input devices on sound settings just type on terminal the following command pulseaudio --start and try to turn on video or audio, but when you reboot your system you need to retype the command. In my case it was the temporary solution.