[Bug 1684108] Re: Broken Audio infrastructure on Kubuntu 17.04

[José Tomás Atria]

This bug is caused by module-device-manager not being loaded when
pulseaudio starts. This command fixes the issue and restores pulseaudio
KDE integration:

$ pactl load-module module-device-manager "do_routing=1"

This command is included in the pulseaudio startup script for X11,
/usr/bin/start-pulseaudio-x11, which is included as part of the XDG
autostart scripts via a reference in
/etc/xdg/autostart/pulseaudio.desktop. As far as I understand the
FreeDesktop standard, .desktop files in the /etc/xdg/autostart folder
should be executed by the desktop manager on startup, which in the case
of KDE is controlled by the script located at /usr/bin/startkde, but the
version shipped by Kubuntu does not seem to make any reference to
/etc/xdg/autostart files.

I have tested that /usr/bin/start-pulseaudio-x11 is not being ran on
startup. I have no idea how KDE is starting pulseaudio, and since
pulseaudio is part of the poetteringverse, determining its execution
model or startup sequence is beyond the comprehension of mere mortals;
but lack of integration between pulseaudio and phonon (the audio system
settings module) is due to that module not being loaded, due to that
script not being ran, due to, I assume, KDE not executing XDG autostart
desktop files.

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https://bugs.launchpad.net/bugs/1684108

Title:
  Broken Audio infrastructure on Kubuntu 17.04

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