Comment 31 for bug 1864871

Similar problem with:
- Ubuntu 20.04 LTS
- Fujitsu LifeBook A530
- $ lspci | grep Audio
00:1b.0 Audio device: Intel Corporation 5 Series/3400 Series Chipset High Definition Audio (rev 05)

THE PROBLEM:
No sound. Gnome audio system settings shows "Dummy Audio" as output device.

Trying with Lubuntu 20.04 on a different partition there's the same problem but running PulseAudio Volume Control it's possible to select: "analog stereo duplex" or "analog stereo output".
Unfortunately there is no setting like this for Gnome.

WORKAROUND:
As reported here https://forum.ubuntu-it.org/viewtopic.php?t=413914 it seems to be a problem related to udev which doesn't find the audio card.

1. Inside /etc/pulse/default.pa find the following code:

.ifexists module-udev-detect.so
load-module module-udev-detect
.else
### Alternatively use the static hardware detection module (for systems that
### lack udev support)
load-module module-detect
.endif

2. Comment the if/else statement:

### Automatically load driver modules depending on the hardware available
#.ifexists module-udev-detect.so
#load-module module-udev-detect
#.else
### Alternatively use the static hardware detection module (for systems that
### lack udev support)
load-module module-detect
#.endif

3. Save the file and restart.