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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