backup the file /lib/udev/rules.d/90-pulseaudio.rules, then edit 90-pulseaudio.rules, find the line "ATTRS{idVendor}=="0bda", ATTRS{idProduct}=="4014", ENV{PULSE_PROFILE_SET}="dell-dock-tb16-usb-audio.conf"", and comment it by adding a # ahead the line, reboot and redo the test.
And Please do a test:
backup the file /lib/udev/ rules.d/ 90-pulseaudio. rules, then edit 90-pulseaudio. rules, find the line "ATTRS{ idVendor} =="0bda" , ATTRS{idProduct }=="4014" , ENV{PULSE_ PROFILE_ SET}="dell- dock-tb16- usb-audio. conf"", and comment it by adding a # ahead the line, reboot and redo the test.