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pacmd
pavucontrol

• /etc/pulse/default.pa
• ~/.config/pulse/default.pa

$ pacmd list | grep "active port"
  active port: <hdmi-output-0>
  active port: <analog-output-lineout>
  active port: <analog-input-linein>
pacmd set-sink-port 0 analog-output-lineout

/etc/pulse/default.pa:
set-sink-port 0 analog-output-lineout

• Navigate to /usr/share/pulseaudio/alsa-mixer/paths
• Find the .conf file for the port you want to disable and add .backup to its name.

In ~/.config/pulse/default.pa comment out the following line:

load-module module-switch-on-port-available

If there is no sound on resume:

alsa force-reload
alsactl store # do this when config is OK