Sorry for taking so long to get back. Unfortunately without hardware that exhibits this behavior, I don't feel I can easily work out what is going on.
If someone is willing to test pulseaudio packages one at a time as I disable and progressively enable ubuntu-touch patches to find the culpret, it would be much appreciated. If you wish to do so, please make sure you have a known working set of uplseaudio packages on your system so you can re-install them after testing so you have a working system again.
Sorry for taking so long to get back. Unfortunately without hardware that exhibits this behavior, I don't feel I can easily work out what is going on.
If someone is willing to test pulseaudio packages one at a time as I disable and progressively enable ubuntu-touch patches to find the culpret, it would be much appreciated. If you wish to do so, please make sure you have a known working set of uplseaudio packages on your system so you can re-install them after testing so you have a working system again.