Audio switches to non-default audio source for newly launch apps and scrubbing in video players

Hi all,

This issue is driving me nuts. I have set my default audio device to be an external USB soundcard (Fiio E10), however when a new app opens, the audio always plays on the laptop's output. Additionally, when I manually change the device, if I then scrub in a playing youtube video, or resize the player, the audio will switch back to the non-default input device.

I'm not sure what info would be helpful, but here's my output from list-sinks:

~                                                                                                                                                                                                                
▶ pacmd list-sinks | grep -e 'name:' -e 'index:'
    index: 0
        name: <alsa_output.pci-0000_00_1f.3.analog-stereo>
    index: 1
        name: <alsa_output.usb-Blue_Microphones_Yeti_Stereo_Microphone-00.analog-stereo>
  * index: 2
        name: <alsa_output.usb-FiiO_DigiHug_USB_Audio-01.analog-stereo>

Can you paste in the contents of the file /etc/pulse/default.pa?

Sure, thanks for the response! My account was on hold so I was unable to respond until now.

▶ cat /etc/pulse/default.pa 
#!/usr/bin/pulseaudio -nF
#
# This file is part of PulseAudio.
#
# PulseAudio is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# PulseAudio is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.

# This startup script is used only if PulseAudio is started per-user
# (i.e. not in system mode)

.fail

### Automatically restore the volume of streams and devices
load-module module-device-restore
load-module module-stream-restore
load-module module-card-restore

### Automatically augment property information from .desktop files
### stored in /usr/share/application
load-module module-augment-properties

### Should be after module-*-restore but before module-*-detect
#load-module module-switch-on-port-available

### Load audio drivers statically
### (it's probably better to not load these drivers manually, but instead
### use module-udev-detect -- see below -- for doing this automatically)
#load-module module-alsa-sink
#load-module module-alsa-source device=hw:1,0
#load-module module-oss device="/dev/dsp" sink_name=output source_name=input
#load-module module-oss-mmap device="/dev/dsp" sink_name=output source_name=input
#load-module module-null-sink
#load-module module-pipe-sink

### Automatically load driver modules depending on the hardware available
.ifexists module-udev-detect.so
load-module module-udev-detect
.else
### Use the static hardware detection module (for systems that lack udev support)
load-module module-detect
.endif

### Automatically connect sink and source if JACK server is present
.ifexists module-jackdbus-detect.so
.nofail
load-module module-jackdbus-detect channels=2
.fail
.endif

### Automatically load driver modules for Bluetooth hardware
.ifexists module-bluetooth-policy.so
load-module module-bluetooth-policy
.endif

.ifexists module-bluetooth-discover.so
load-module module-bluetooth-discover
.endif

### Load several protocols
load-module module-dbus-protocol
.ifexists module-esound-protocol-unix.so
load-module module-esound-protocol-unix
.endif
load-module module-native-protocol-unix

### Network access (may be configured with paprefs, so leave this commented
### here if you plan to use paprefs)
#load-module module-esound-protocol-tcp
#load-module module-native-protocol-tcp
#load-module module-zeroconf-publish

### Load the RTP receiver module (also configured via paprefs, see above)
#load-module module-rtp-recv

### Load the RTP sender module (also configured via paprefs, see above)
#load-module module-null-sink sink_name=rtp format=s16be channels=2 rate=44100 sink_properties="device.description='RTP Multicast Sink'"
#load-module module-rtp-send source=rtp.monitor

### Load additional modules from GSettings. This can be configured with the paprefs tool.
### Please keep in mind that the modules configured by paprefs might conflict with manually
### loaded modules.
.ifexists module-gsettings.so
.nofail
load-module module-gsettings
.fail
.endif


### Automatically restore the default sink/source when changed by the user
### during runtime
### NOTE: This should be loaded as early as possible so that subsequent modules
### that look up the default sink/source get the right value
load-module module-default-device-restore

### Automatically move streams to the default sink if the sink they are
### connected to dies, similar for sources
load-module module-rescue-streams

### Make sure we always have a sink around, even if it is a null sink.
load-module module-always-sink

### Honour intended role device property
load-module module-intended-roles

### Automatically suspend sinks/sources that become idle for too long
load-module module-suspend-on-idle

### If autoexit on idle is enabled we want to make sure we only quit
### when no local session needs us anymore.
.ifexists module-console-kit.so
load-module module-console-kit
.endif
.ifexists module-systemd-login.so
load-module module-systemd-login
.endif

### Enable positioned event sounds
load-module module-position-event-sounds

### Cork music/video streams when a phone stream is active
load-module module-role-cork

### Modules to allow autoloading of filters (such as echo cancellation)
### on demand. module-filter-heuristics tries to determine what filters
### make sense, and module-filter-apply does the heavy-lifting of
### loading modules and rerouting streams.
load-module module-filter-heuristics
load-module module-filter-apply

### Make some devices default
#set-default-sink output
#set-default-source input

Also, here's my full setup:

how did you set the default sink?
does cat ~/.config/pulse/*default-sink show correct device name for default?

suggest you install pavucontrol-qt and observe 'Playback' tab
audio playback streams should always play to default sink, unless stream is manually assigned to use another device

Thanks for the reply.

cat ~/.config/pulse/*default-sink does indeed show the correct device name for default.

I used pavucontrol (as opposed topavucontrol-qtto set the default.

observe 'Playback' tab
audio playback streams should always play to default sink, unless stream is manually assigned to use another device

I did that, and it does exactly the opposite. always uses the non-default sink (alsa_output.pci-0000_00_1f.3.analog-stereo>)

Anyone have other suggestions/guidance here? Sorry to bump but this is driving me absolutely mad.

Have you checked the defaults in System Settings->Multimedia?

plasma has a ton of audio device defaults in those menus.

When I head there, I get the message:

The module Multimedia is not a valid configuration module. The diagnosis is: The desktop file settings-hardware-multimedia.desktop does not specify a library

Weird, after a few tries of opening, I was able to get it to display the audio preferences.

I checked each item in the "Audio Playback" category individually and they were all showing my desired device at the top of their list.

Then, I looked at the category itself, and sure enough the device was at the bottom. Upon promoting it to the top, things seem to be working as intended now. Thanks so much @dalto, you saved what precious little hair I've left!

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