I have a problem similar to the one described here: 20.04: internal speaker (Audio) is not working in Ubuntu 20.04 LTS after upgrading from Ubuntu 18.04 LTS
None of the solutions posted there worked for me, also the problem is a bit different in my case.
In a summary: since I've upgraded to Ubuntu 20.04, the audio normally works for me. However, sometimes after I put my system in standby and then resume it, my audio no longer works and I see only "Dummy output" in the list of audio output devices.
Restarting the computer solves the issue for me. However, it's quite annoying that I have to restart it every time.
sudo lshw -C multimedia
*-multimedia
description: Audio device
product: GP104 High Definition Audio Controller
vendor: NVIDIA Corporation
physical id: 0.1
bus info: pci@0000:01:00.1
version: a1
width: 32 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list
configuration: driver=snd_hda_intel latency=0
resources: irq:17 memory:f7080000-f7083fff
*-usb:0
description: Video
product: USB 2.0 Camera
vendor: Sonix Technology Co., Ltd.
physical id: 1
bus info: usb@3:3.1
version: 0.00
capabilities: usb-2.00
configuration: driver=snd-usb-audio maxpower=500mA speed=480Mbit/s
*-multimedia
description: Audio device
product: 8 Series/C220 Series Chipset High Definition Audio Controller
vendor: Intel Corporation
physical id: 1b
bus info: pci@0000:00:1b.0
version: 04
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list
configuration: driver=snd_hda_intel latency=0
resources: irq:32 memory:f7330000-f7333fff
sudo lshw -C multimediatell you? – starkus May 17 '20 at 10:42pulseaudio -kfix it temporarily? – starkus May 17 '20 at 10:44pulseaudio -knext time I'll have the same issue (as it occurs randomly) – Francesco Borzi May 17 '20 at 12:14echo "options snd-hda-intel model=generic" | sudo tee -a /etc/modprobe.d/alsa-base.confgive a try. Further reading --> https://www.linuxuprising.com/2018/06/fix-no-sound-dummy-output-issue-in.html – starkus May 17 '20 at 12:17