dbus-monitor shows the keys here, too:
... signal sender=:1.0 -> dest=(null destination) path=/org/gnome/SettingsDaemon/MediaKeys; interface=org.gnome.SettingsDaemon.MediaKeys; member=MediaPlayerKeyPressed string "" string "Previous" signal sender=:1.30 -> dest=(null destination) path=/org/gnome/Rhythmbox/Player; interface=org.gnome.Rhythmbox.Player; member=elapsedChanged uint32 47 signal sender=:1.0 -> dest=(null destination) path=/org/gnome/SettingsDaemon/MediaKeys; interface=org.gnome.SettingsDaemon.MediaKeys; member=MediaPlayerKeyPressed string "" string "Next" signal sender=:1.30 -> dest=(null destination) path=/org/gnome/Rhythmbox/Player; interface=org.gnome.Rhythmbox.Player; member=elapsedChanged uint32 48 signal sender=:1.0 -> dest=(null destination) path=/org/gnome/SettingsDaemon/MediaKeys; interface=org.gnome.SettingsDaemon.MediaKeys; member=MediaPlayerKeyPressed string "" string "Play" ...
dbus-monitor shows the keys here, too:
... gnome/SettingsD aemon/MediaKeys ; interface= org.gnome. SettingsDaemon. MediaKeys; member= MediaPlayerKeyP ressed gnome/Rhythmbox /Player; interface= org.gnome. Rhythmbox. Player; member= elapsedChanged gnome/SettingsD aemon/MediaKeys ; interface= org.gnome. SettingsDaemon. MediaKeys; member= MediaPlayerKeyP ressed gnome/Rhythmbox /Player; interface= org.gnome. Rhythmbox. Player; member= elapsedChanged gnome/SettingsD aemon/MediaKeys ; interface= org.gnome. SettingsDaemon. MediaKeys; member= MediaPlayerKeyP ressed
signal sender=:1.0 -> dest=(null destination) path=/org/
string ""
string "Previous"
signal sender=:1.30 -> dest=(null destination) path=/org/
uint32 47
signal sender=:1.0 -> dest=(null destination) path=/org/
string ""
string "Next"
signal sender=:1.30 -> dest=(null destination) path=/org/
uint32 48
signal sender=:1.0 -> dest=(null destination) path=/org/
string ""
string "Play"
...