/sys/class/sound/hwC0D0/init_pin_configs:
0x1e 0x04451120

the BIOS default is optical instead of RCA


Pin Default 0x04451120: [Jack] SPDIF Out at Ext Right
    Conn = Optical, Color = Black
    DefAssociation = 0x2, Sequence = 0x0
    Misc = NO_PRESENCE

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https://bugs.launchpad.net/bugs/1040873

Title:
  [N56VZ, Realtek ALC663, Black Headphone Out, Right] No sound at all:
  Subwoofer not working

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