Reset all USB devices, and move all dangling audio streams to re-connected external Schitt Modi DAC.

fix_usb.sh

#!/bin/bash

if [[ $EUID != 0 ]] ; then
  echo This must be run as root!
  exit 1
fi


# Reset USB devices.
for xhci in /sys/bus/pci/drivers/?hci_hcd ; do

  if ! cd $xhci ; then
    echo Weird error. Failed to change directory to $xhci
    exit 1
  fi

  echo Resetting devices from $xhci...

  for i in ????:??:??.? ; do
  	if [[ "$i" != "????:??:??.?" ]]; then
	  	echo " .. resetting $i"
	    echo -n "$i" > unbind
	    echo -n "$i" > bind
	fi
  done
done
echo ""


# Wait for the Schitt Modi to be recognised as an audio output.
newSink="alsa_output.usb-Schiit_Audio_Schiit_Modi_3-00.analog-stereo"

while ! sudo -u "#1000" XDG_RUNTIME_DIR=/run/user/1000 pactl list short sinks | grep "$newSink"; do
	echo "Waiting for Schitt Modi..."
	sleep 1
done
echo ""

# Switch to Schitt Modi audio output.
sudo -u "#1000" XDG_RUNTIME_DIR=/run/user/1000 pactl set-default-sink "$newSink"
sudo -u "#1000" XDG_RUNTIME_DIR=/run/user/1000 pactl list short sink-inputs|while read stream; do
    streamId=$(echo $stream|cut '-d ' -f1)
    echo "moving stream $streamId"
    sudo -u "#1000" XDG_RUNTIME_DIR=/run/user/1000 pactl move-sink-input "$streamId" "$newSink"
done