Suddenly no more sound on Ubuntu 20.04

TL;DR

I got the inspiration for the solution from the answer here: https://askubuntu.com/a/862896/39456, I found this question through the proposed solution by @laugeo: thanks for the hint with the codec, mine wasn't on the list.

The problem

Until last week-end I had still sound on my PC. Then after an update: no more sound. What is strange though, I booted up the PC yesterday with the live image of Ubuntu 20.04 and there I have sound!

Since then I tried already the following tips an tricks without success:

• No sound on Ubuntu 20.04
• https://www.maketecheasier.com/fix-no-sound-issue-ubuntu
• (yet another) No sound in Ubuntu 18.04

Again, booting into the live Ubuntu 20.04 gives me sound, booting from hard drive gives nothing.

What else I tried was to plug the speakers into the screen (HDMI), but still silence. Although the parameters window for the speaker shows that there is sound played, just not for real.

Here's my setup:

lspci |grep 'Audio'
1d:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere HDMI Audio [Radeon RX 470/480 / 570/580/590]
1f:00.3 Audio device: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) HD Audio Controller

Has anyone any idea how I can get the sound back? Because, as mentioned, the sound was there until last week-end.

The solution

In pavucontrol under the Configuration tab I changed the Profile for my sound card to Analog Stereo Duplex and then under the Output tab I switched the port to the right one. Sound is back!

Solution 1:

Various checks:

• In pavucontrol , does vumeter move when playing ? As your sound device is the 2nd one (as seen in alsamixer) , I suppose you know that you must select it as default in devices tab with green button .

• After that and if you have dual boot , check fastboot is disabled in windows .

• As you have problem since update, the new alsa driver may need additional parameter :
  you can try to check your codec model :
  cat /proc/asound/card0/codec#* |grep Cod
  Then search your codec here or here and from the available models under this codec, add line with a similar model to your pc at the end of file:
  /etc/modprobe.d/alsa-base.conf
  F.i. if codec is ALC898 and pc is Lenovo Yoga:
  options snd-hda-intel model=lenovo-y530
  Try also
  options snd-hda-intel model=auto

Command to check codec errors at boot:
dmesg |grep codec