/etc/xdg/autostart/cinnamon-sound-applet.desktop is in cinnamon-control-center 2.8.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | [Desktop Entry]
Icon=cs-sound
Exec=cinnamon-sound-applet
Terminal=false
Type=Application
Categories=
NoDisplay=true
X-GNOME-Autostart-Notify=true
AutostartCondition=GNOME3 if-session gnome-fallback
OnlyShowIn=X-Cinnamon;
Name=Volume Control
Comment=Show desktop volume control
X-Ubuntu-Gettext-Domain=cinnamon-control-center
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