http://www.asrock.com/mb/Intel/H55M%20Pro/

there is optical spdif at the rear panel and internal HDMI SPDIF
connector



seem bios did not setup pin default correctly


Node 0x2e [Pin Complex] wcaps 0x400701: Stereo Digital
  Pincap 0x00000010: OUT
  Pin Default 0x474411f0: [N/A] SPDIF Out at Ext Rear Panel
    Conn = RCA, Color = Black
    DefAssociation = 0xf, Sequence = 0x0
    Misc = NO_PRESENCE
  Pin-ctls: 0x00:
  Power states:  D0 D1 D2 D3
  Power: setting=D0, actual=D0
  Connection: 1
     0x0f


the should be red light at the optical spdif when iec958 playback switch
is ON

try hdajackretask to change pin default from [N/A] to [Jack] , RCA to
Optical

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https://bugs.launchpad.net/bugs/1453282

Title:
  [Neither headphones nor speakers are displayed under "All
  Settings"->Sound, VIA VT1718S, Green Headphone Out, Front] No sound at
  all

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