Comment 13 for bug 1256646

https://bugzilla.kernel.org/enter_bug.cgi?product=Drivers

you should file a bug report at kernel.org

most likely you need to use hdajackretask

to change pin default of node 0x20 of VT1708B code from

  Pin Default 0x18560110: [Jack] Digital Out at Int HDMI
    Conn = Digital, Color = Unknown
    DefAssociation = 0x1, Sequence = 0x0
   Misc = NO_PRESENCE

to

 Pin Default 0x07451140: [Jack] SPDIF Out at Ext Rear
    Conn = Optical, Color = Black
    DefAssociation = 0x4, Sequence = 0x0
    Misc = NO_PRESENCE

so that digital device 1 can be created for optical spdif instead of hdmi

MCP77/78 can create hdmi device 3 instead of 7 for the first pin node 0x5

Node 0x05 [Pin Complex] wcaps 0x400381: Stereo Digital
  Control: name="HDMI/DP,pcm=7 Phantom Jack", index=0, device=0
  Pincap 0x00000014: OUT Detect
  Pin Default 0x18560110: [Jack] Digital Out at Int HDMI
    Conn = Digital, Color = Unknown
    DefAssociation = 0x1, Sequence = 0x0
    Misc = NO_PRESENCE
  Pin-ctls: 0x40: OUT
  Unsolicited: tag=00, enabled=0
  Connection: 1
     0x04