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0e1f616
(Get the code!)
I believe we're experiencing basically the same problem with the upcoming System76 Haswell desktop products.
The problem (for us) is that HDMI audio devices simply don't show up at all in the sound menu. We're able to fix this by cherry-picking these 3 commits from mainline:
9419ab6b72325e2
ALSA: hda - Add power state filtering
c88d4e84e639df9
ALSA: hda - Yet another fix for broken HSW HDMI pin connections
17df3f55652f7ea
ALSA: hda - Apply pin-enablement workaround to all Haswell HDMI codecs
These 3 commits are already present in the Saucy tree, although it seems there is perhaps a regression currently in Saucy in that the HDMI device will only show up if connected at boot, wont show up if you plug in a different monitor after initially booting with a monitor that lacks HDMI audio.
Anyway, for reference here are the mainline commits, which you can cleanly cherry pick into the current Raring tree:
https:/
https:/
https:/