Ubuntu 設定預設聲音輸出

參考 How do you set a default audio output device in Ubuntu 18.04?
參考 How to change pulseaudio sink with “pacmd set-default-sink” during playback?

vidia@nvidia-desktop:~$ pactl list short

sources 0 alsa_output.platform-3510000.hda.hdmi-stereo-extra2.monitor module-alsa-card.c s16le 2ch 44100Hz SUSPENDED 

1 alsa_output.platform-sound.analog-stereo.monitor module-alsa-card.c s16le 2ch 44100Hz SUSPENDED 

2 alsa_input.platform-sound.analog-stereo module-alsa-card.c s16le 2ch 44100Hz SUSPENDED

nvidia@nvidia-desktop:~$ sudo vi /etc/pulse/default.pa  

### Make some devices default 

#set-default-sink output 

set-default-sink 0 

#set-default-source input

nvidia@nvidia-desktop:~$ pacmd list-sinks
2 sink(s) available.
  * index: 0
name: <alsa_output.platform-3510000.hda.hdmi-stereo-extra2>
driver: <module-alsa-card.c>

    index: 1

name: <alsa_output.platform-sound.analog-stereo>

driver: <module-alsa-card.c>

nvidia@nvidia-desktop:~$ pacmd set-default-sink 1

nvidia@nvidia-desktop:~$ pacmd set-default-sink 0