the source of alsa-driver in saucy is quite old (16-Feb, 2013)

http://bazaar.launchpad.net/~ubuntu-branches/ubuntu/saucy/alsa-
driver/saucy/files/head:/alsa-kernel/pci/hda/

but those fix at 22-Feb, 2013

http://git.alsa-project.org/?p=alsa-
lib.git;a=commitdiff;h=f5f45589f81c46d4ca4cbbe089441a0f7ac5e197;hp=8c6da54073b2c966d9a4e137ba4d521eac92816f

you may need a trim version of snd-hda-intel.conf 
without upgrade alsa-lib to use "skip_rest true"

just add index 16 to iec958


                              name "IEC958 Playback Default"
+                               index 16
                                  optional true
                                 lock true
                                 preserve true
                                 value [ $AES0 $AES1 $AES2 $AES3 ]
                        }
                        {
                                 name "IEC958 Playback Switch"
+                             index 16   
                               optional true
                                value true

try latest alsa -driver

https://wiki.ubuntu.com/Audio/UpgradingAlsa/DKMS

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https://bugs.launchpad.net/bugs/1249705

Title:
  HDMI output not available in 13.10

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