http://git.alsa-project.org/?p=alsa-
lib.git;a=blob_plain;f=src/conf/cards/HDA-Intel.conf;hb=HEAD

the workaround may be

1) remove index= 16 and skip_rest for HDA-Intel.pcm.iec958.0 
2) change index $CTLINDEX to index 1 for  HDA-Intel.pcm.hdmi.common


ftp://download.nvidia.com/XFree86/gpu-hdmi-audio-document/gpu-hdmi-audio.html

what you need to discuss with pulseaudio and alsa develoers are

12.5. Verify Your ELD Is Valid

To validate that the ALSA driver is aware of your monitor, check the eld
files. Recall that older chipsets (ION and earlier) don’t support ELD
reporting, and hence the ELD files will not exist. In this case, ALSA
always assumes that all audio features are available.

For example,

$ cat /proc/asound/card1/eld#3.0
monitor_present     1
eld_valid           1
monitor_name        DELL U2410
connection_type     HDMI
eld_version         [0x2] CEA-861D or below
edid_version        [0x3] CEA-861-B, C or D
manufacture_id      0xac10
product_id          0xf016
port_id             0x40000
support_hdcp        0
support_ai          0
audio_sync_delay    0
speakers            [0x1] FL/FR
sad_count           1
sad0_coding_type    [0x1] LPCM
sad0_channels       2
sad0_rates          [0xe0] 44100 48000 88200
sad0_bits           [0xe0000] 16 20 24

For HDMI audio to work, both monitor_present and eld_valid must be 1.
Furthermore, there will typically be evidence of at least some supported
audio formats.

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

Title:
  HDMI output not available in 13.10

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