[Pkg-utopia-maintainers] Bug#1012186: dbus: does not recognize volume media keys as MPRIS events

[Claudio]

Package: dbus
Version: 1.14.0-1
Severity: normal
X-Debbugs-Cc: flyingstar16 at gmail.com

Dear Maintainer,

My system does not react to Volume Up/Down/Mute events, but still reacts to Play/Pause/Previous/Next.

Trying to trace the event I checked GNOME keybindings; the UI recognizes the Audio Raise/Lower/Mute Volume inputs when binding the keys, but nothing happens when I try to use them; xev does not recognize any XF86Audio* events (volume or play/pause/etc.).

>From dbus-monitor I noticed that Play/Pause/Previous/Next events are recorded as (this is "Pause"):

signal time=1654019599.276609 sender=:1.37 -> destination=:1.63 serial=7245 path=/org/gnome/Shell; interface=org.gnome.Shell; member=AcceleratorActivated
   uint32 134
   array [
      dict entry(
         string "timestamp"
         variant             uint32 179801356
      )
      dict entry(
         string "action-mode"
         variant             uint32 1
      )
      dict entry(
         string "device-node"
         variant             string "/dev/input/event4"
      )
   ]
method call time=1654019599.276955 sender=:1.63 -> destination=:1.202 serial=366 path=/org/mpris/MediaPlayer2; interface=org.mpris.MediaPlayer2.Player; member=PlayPause
method return time=1654019599.277245 sender=:1.202 -> destination=:1.63 serial=396 reply_serial=366
signal time=1654019599.304921 sender=:1.202 -> destination=(null destination) serial=397 path=/org/mpris/MediaPlayer2; interface=org.freedesktop.DBus.Properties; member=PropertiesChanged
   string "org.mpris.MediaPlayer2.Player"
   array [
      dict entry(
         string "PlaybackStatus"
         variant             string "Paused"
      )
   ]
   array [
   ]


but Volume manipulation inputs do not generate MPRIS events (uint 186 is raise volume, 183 is lower volume. Neither is followed by the corresponding MPRIS message):

signal time=1654019648.231914 sender=:1.37 -> destination=:1.63 serial=7251 path=/org/gnome/Shell; interface=org.gnome.Shell; member=AcceleratorActivated
   uint32 186
   array [
      dict entry(
         string "timestamp"
         variant             uint32 179850312
      )
      dict entry(
         string "action-mode"
         variant             uint32 1
      )
      dict entry(
         string "device-node"
         variant             string "/dev/input/event4"
      )
   ]
signal time=1654019648.583477 sender=:1.37 -> destination=:1.63 serial=7252 path=/org/gnome/Shell; interface=org.gnome.Shell; member=AcceleratorActivated
   uint32 183
   array [
      dict entry(
         string "timestamp"
         variant             uint32 179850664
      )
      dict entry(
         string "action-mode"
         variant             uint32 1
      )
      dict entry(
         string "device-node"
         variant             string "/dev/input/event4"
      )
   ]

Changing volume via `playerctl volume` works; I wrote a script to leverage it and change volume via GNOME keybindings, but that didn't work either (same issue: running the script manually works, but trying to get the media keys to call the script doesn't).

I tried two different keyboards, with the same outcome.

Hope this can be fixed (and that it's actually dbus doing this - sorry if I misfiled!).

Thanks!

-- System Information:
Debian Release: bookworm/sid
  APT prefers testing
  APT policy: (500, 'testing'), (499, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 5.17.0-1-amd64 (SMP w/24 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 dbus depends on:
ii  dbus-bin                1.14.0-1
ii  dbus-daemon             1.14.0-1
ii  dbus-system-bus-common  1.14.0-1
ii  init-system-helpers     1.63
ii  libc6                   2.33-7
ii  libdbus-1-3             1.14.0-1
ii  libexpat1               2.4.8-1
ii  libsystemd0             250.4-1

dbus recommends no packages.

Versions of packages dbus suggests:
ii  dbus-user-session [default-dbus-session-bus]  1.14.0-1
ii  dbus-x11 [dbus-session-bus]                   1.14.0-1

Versions of packages dbus is related to:
ii  dbus-x11      1.14.0-1
ii  systemd       250.4-1
ii  systemd-sysv  250.4-1

-- no debconf information