Bionic pavucontrol fails to set default device if usb sink or source exists

[Erick Brunzell]

Just as the title says, if a usb sound card is in use pavucontol's settings are ignored. This appears to be an unintended result of the changes made to address bug #1702794. Specifically if you now look at /etc/pulse/default.pa you'll find this section:

### Use hot-plugged devices like Bluetooth or USB automatically (LP: #1702794)
.ifexists module-switch-on-connect.so
load-module module-switch-on-connect
.endif

So you must comment out those three lines in order for pavucontrol device default settings to be respected if a usb sound card is plugged in at reboot or startup. It's not a big deal but I hadn't run across this in the past and couldn't find an existing bug report.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: pavucontrol 3.0-4
ProcVersionSignature: Ubuntu 4.15.0-45.48-generic 4.15.18
Uname: Linux 4.15.0-45-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
CurrentDesktop: GNOME-Flashback:GNOME
Date: Tue Feb 19 21:05:18 2019
InstallationDate: Installed on 2018-01-28 (387 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
SourcePackage: pavucontrol
UpgradeStatus: Upgraded to bionic on 2018-08-15 (188 days ago)