Pipewire occasionally loses my USB interfaces

[Jussi Lind]

I use Behringer X32 Producer and Steinberg UR 22 mk II as my USB audio interfaces. I didn't have any problems on Ubuntu 22.04, but when I upgraded to Ubuntu 24.04 LTS, my interfaces started to disappear.

Steps to reproduce (doesn't happen always), with Ubuntu constantly running:

1) Switch the audio interfaces off (or disconnect the USB)

2) Switch the audio interfaces back on

3) Go to Ubuntu's audio settings

What happens:

- No external interfaces are listed. I have to run "systemctl --user restart pipewire pipewire-pulse" to get them back.

- They are still seen by e.g. Audacity via ALSA, so this is definitely an issue with the Ubuntu stuff.

What should happen:

- The interfaces should be always re-detected automatically after a power cycle and visible in the audio settings.

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: pipewire 1.0.5-1ubuntu3
ProcVersionSignature: Ubuntu 6.8.0-57.59-generic 6.8.12
Uname: Linux 6.8.0-57-generic x86_64
NonfreeKernelModules: zfs nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.28.1-0ubuntu3.5
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Tue May 6 15:58:54 2025
InstallationDate: Installed on 2019-11-09 (2005 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
RebootRequiredPkgs: Error: path contained symlinks.
SourcePackage: pipewire
UpgradeStatus: Upgraded to noble on 2025-03-31 (36 days ago)