bdd

  # x0f: DisplayPort-1
  # x1b: USB-C
  DDC_SOURCES=("x0f" "x1b")

  switchkvm() {
    local vcp_input_src="x60"
    local current next src
    current=$(ddcutil -t getvcp ${vcp_input_src} | awk '{ print $4 }')
    for src in "${DDC_SOURCES[@]}"; do
      if [[ ${src} != "${current}" ]]; then
        next=${src}
      fi
    done
  
    if [[ -z ${next} ]]; then
      echo "No eligible alternate input in \$DDC_SOURCES" >&2
      echo "\$DDC_SOURCES=(${DDC_SOURCES[*]}); current=${current}"
      return 1
    fi

    ddcutil setvcp "${vcp_input_src}" "${next}"
  }