alc268

ALC267/268
==========
  quanta-il1    Quanta IL1 mini-notebook
  3stack        3-stack model
  toshiba       Toshiba A205
  acer          Acer laptops
  acer-dmic     Acer laptops with digital-mic
  acer-aspire   Acer Aspire One
  dell          Dell OEM laptops (Vostro 1200)
  zepto         Zepto laptops
  test          for testing/debugging purpose, almost all controls can
                adjusted.  Appearing only when compiled with
                $CONFIG_SND_DEBUG=y
  auto          auto-config reading BIOS (default)