Volume increases on its own when phone is muted.

[Josh Arenson]

I'm traveling with limited bandwidth and electricity so I lack the resources to investigate this much further today.

Steps to reproduce:
1. Put phone in silent mode
2. Start playing "machines vs machines"
3. Sound plays at full volume (don't know if this is, itself, a bug)
4. Turn down volume and continue playing.

Expected behavior: Volume stays silent
Actual behavior: Every 20 seconds or so, the volume will increase itself several levels

Running rc-proposed on arale

[Josh Arenson (josharenson)]

Also, for completeness, I was in flight mode as well.

[Michał Sawicz (saviq)]

Oh yikes. Did you see the volume notification?

[Michael Zanetti (mzanetti)]

This is the same as https://bugs.launchpad.net/canonical-devices-system-image/+bug/1478506

Not sure why that has been marked as duplicate of something different tho.

What happens is that the system volume is changed every time an Audio {} or SoundEffect {} item is created.

[Xavi Garcia (xavi-garcia-mena)]

As Michael points out... this is partly a duplicate of the stated bug.

I landed a branch for OTA-9 that doesn't fully fix bug #1485522, but that avoids the volume changes from the multimedia sink.
We are waiting for a Qt patch to fully fix the volume change issue.

Regarding Silent Mode: the sound spec state that multimedia sounds should not be muted.
https://wiki.ubuntu.com/Sound#Silent_Mode