@Raymond,from reading the description of that patch it looks like it might be a regression of it.
** Changed in: pulseaudio (Ubuntu) Status: Incomplete => New -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to pulseaudio in Ubuntu. https://bugs.launchpad.net/bugs/1495293 Title: Upon switching sound output device sound mutes Status in pulseaudio package in Ubuntu: New Bug description: So this is what happened, I just plugged in my headphones, and even though before when I was using the volume was up almost full, the volume went to mute, then I turned up the volume, and when I switched back to my normal speakers, the volume went to mute again! So it seems annoyingly that if I switch from one sound output device to the other, if I change the volume from the newly set mute to a different volume it automatically turns the other to mute (although randomly it does other things)... Now I'm also finding that if I turn the volume up, then switch and it goes to mute, if I then switch back without changing anything the volume goes to just above mute (but sometimes mute) on the one I am switching to. And I am seeing lots of other strange behaviour like this. I have attempted renaming the "~/.config/pulse" directory and then running "pulseaudio -k", but the problem still remains. Adapted from my AskUbuntu question: https://askubuntu.com/questions/673735/upon-switching-sound-output- device-sound-mutes --- OS Information: No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 15.04 Release: 15.04 Codename: vivid Flavour: GNOME GNOME Version: 3.16 Package Information: pulseaudio: Installed: 1:6.0-0ubuntu6 Candidate: 1:6.0-0ubuntu6 Version table: *** 1:6.0-0ubuntu6 0 500 http://archive.ubuntu.com/ubuntu/ vivid/main amd64 Packages 100 /var/lib/dpkg/status To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1495293/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp