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Is dbus-user-session / libpam-systemd installed?

What's the output of systemctl --user status wireplumber.service

Am 04.03.23 um 15:11 schrieb James Addison:
Package: wireplumber
Version: 0.4.13-1
Severity: normal

Dear Maintainer,

On this Debian 12 (bookworm) system, sound output in the GNOME and Wayland
desktop environment became unavailable recently.

The only output device listed in the 'Sound' panel of gnome-control-center
is 'Dummy Output'; however, multiple devices are listed in the output of
the 'aplay -l' command:

   **** List of PLAYBACK Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: CX20753/4 Analog [CX20753/4 Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
   ...


The following entries are present in the system journal for wireplumber, as
produced by running 'journalctl --user --merge --unit wireplumber':

   wireplumber[pid]: Failed to connect to session bus: Unable to autolaunch a 
dbus-daemon without a $DISPLAY for X11
   wireplumber[pid]: Error acquiring bus address: Cannot autolaunch D-Bus 
without X11 $DISPLAY
   wireplumber[pid]: <12-digit-hex>: leaked proxy <12-digit-hex> id:<integer-id>
   wireplumber[pid]: disconnected from pipewire


As a workaround, running 'wireplumber' from the command-line (using the
logged-in user account) restores the expected behaviour: sound is emitted
again, and audio output devices are listed in gnome-control-center.

Thank you,
James

-- System Information:
Debian Release: bookworm/sid
   APT prefers testing
   APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 6.1.0-5-amd64 (SMP w/2 CPU threads; PREEMPT)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), 
LANGUAGE=en_GB:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages wireplumber depends on:
ii  init-system-helpers   1.65.2
ii  libc6                 2.36-8
ii  libglib2.0-0          2.74.5-1
ii  libpipewire-0.3-0     0.3.65-3
ii  libwireplumber-0.4-0  0.4.13-1
ii  pipewire              0.3.65-3

Versions of packages wireplumber recommends:
ii  pipewire-pulse  0.3.65-3

Versions of packages wireplumber suggests:
ii  libspa-0.2-bluetooth  0.3.65-3
pn  wireplumber-doc       <none>

-- no debconf information

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