Bug#842842: [phonon] Audio device profile gets changed without user interaction

[georg@schorsch-tech.de]

> ¡Hola Georg!
>

Hi Maximiliano!

> The first one shows the default behavior of pulseaudio when a new sound
> sink
> is added to the system. While your original report claims that nothing
> changed in
> the system.
>
> The second link seems to be broken.
>
> My experience with digital outputs (connecting my speakers to a
> monitor) is that the monitor might disable the audio channel when the
> monitor
> enters in powersaving mode, so pulseaudio redirects the current audio
> streams
> to a different sink. And waking up the monitor might trigger the reverse
> redirection.
>
> I haven't seen this behavior for quite some time now, though, but I'm
> using
> an analog output.
>
> In any case, pulseaudio would need some kind of event to trigger the
> switch,
> either that a new audio sink is available or that the digital sink is not
> or
> is producing errors, something like that.
>
> From the phonon perspective, I think that the issue needs to be
> reassigned to the pulseaudio maintainers, but you'll need to provide more
> information about it. Before that, it might be worthwhile
> to test once again using pulseaudio and the phonon's gstreamer backend.

The optical SPDIF output is connected to my Yamaha amplifier. It certainly
does not switch off.
This happens when i watch a movie or YouTube Video. It doesnt depend on
the used application. I left the phonon dialog open to change the setup of
my audio output devices. This way i can just click on the Task bar to
change to the Dialog and Switch it back to SPDIF. Sometimes it switches
after 5 secs to analog Audio after i set it again to SPDIF, sometimes i
dont need to bother for 2 hours.

It is not an option to replace my desktop mainboard because of this. There
is also no event that something failed in dmesg. The hardware is reliable
when i use alsa. So it is pulseaudio.

Debugging pulseaudio seems like a ..... challanging task as i downloaded
the sources and rebuilt it for myself to investigate the issue.

Is there an option to just disable the automatic switching of sinks?