Bug#805414: gdm3: disable pulseaudio to prevent capturing A2DP sink on session start

[Jérémy Lal]

Package: gdm3
Version: 3.18.0-2
Severity: normal

Dear Maintainer,

i'm using a typical gdm3 / gnome-shell 3.18 install and i connect
a bluetooth headset.
At some point in the past (maybe gnome < 3.18 i don't know exactly),
the headset was appearing in the output list of pulseaudio gnome
preferences. Now it never appears.

Reading https://wiki.debian.org/BluetoothUser/a2dp i applied the
"troubleshooting" section explaining how to prevent GDM from
capturing A2DP sink on session start. Now it works again.

So naturally i wonder why it isn't setup like this by default,
and why would one let gdm3 control sound devices.

Jérémy

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (670, 'unstable'), (650, 'testing'), (590, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 4.1.6 (SMP w/4 CPU cores)
Locale: LANG=fr_FR.utf8, LC_CTYPE=fr_FR.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages gdm3 depends on:
ii  accountsservice                       0.6.40-3
ii  adduser                               3.113+nmu3
ii  dconf-cli                             0.24.0-2
ii  dconf-gsettings-backend               0.24.0-2
ii  debconf [debconf-2.0]                 1.5.58
ii  gir1.2-gdm3                           3.18.0-2
ii  gnome-session [x-session-manager]     3.18.1.2-1
ii  gnome-session-bin                     3.18.1.2-1
ii  gnome-settings-daemon                 3.18.2-1
ii  gnome-shell                           3.18.2-1
ii  gnome-terminal [x-terminal-emulator]  3.18.2-1
ii  gsettings-desktop-schemas             3.18.1-1
ii  libaccountsservice0                   0.6.40-3
ii  libaudit1                             1:2.4.4-4
ii  libc6                                 2.19-22
ii  libcanberra-gtk3-0                    0.30-2.1
ii  libcanberra0                          0.30-2.1
ii  libgdk-pixbuf2.0-0                    2.32.2-1
ii  libgdm1                               3.18.0-2
ii  libglib2.0-0                          2.46.2-1
ii  libglib2.0-bin                        2.46.2-1
ii  libgtk-3-0                            3.18.4-1
ii  libpam-modules                        1.1.8-3.1
ii  libpam-runtime                        1.1.8-3.1
ii  libpam-systemd                        227-3
ii  libpam0g                              1.1.8-3.1
ii  librsvg2-common                       2.40.11-1
ii  libselinux1                           2.3-2+b1
ii  libsystemd0                           227-3
ii  libwrap0                              7.6.q-25
ii  libx11-6                              2:1.6.3-1
ii  libxau6                               1:1.0.8-1
ii  libxdmcp6                             1:1.1.2-1
ii  lsb-base                              9.20150917
ii  metacity [x-window-manager]           1:3.18.1-1
ii  mutter [x-window-manager]             3.18.2-1
ii  policykit-1                           0.105-13
ii  ucf                                   3.0031
ii  x11-common                            1:7.7+12
ii  x11-xserver-utils                     7.7+5
ii  xterm [x-terminal-emulator]           320-1

Versions of packages gdm3 recommends:
ii  at-spi2-core               2.18.3-1
ii  desktop-base               8.0.2
ii  gnome-icon-theme           3.12.0-1
ii  gnome-icon-theme-symbolic  3.12.0-1
ii  x11-xkb-utils              7.7+2
ii  xserver-xephyr             2:1.17.3-2
ii  xserver-xorg               1:7.7+12
ii  zenity                     3.18.1.1-1

Versions of packages gdm3 suggests:
pn  gnome-orca            <none>
ii  libpam-gnome-keyring  3.18.2-1

-- debconf information:
* shared/default-x-display-manager: gdm3
  gdm3/daemon_name: /usr/sbin/gdm3