It does show up as "HDMI / Displayport 3" when on 3.8.0-17 kernel and
the speaker-test works then even without specifing the exact device. I
did the speaker-test on the 3.8.0-18 with your exact specs and it gave
out this error:

speaker-test 1.0.25

Playback device is hdmi:0,2
Stream parameters are 48000Hz, S16_LE, 2 channels
WAV file(s)
Playback open error: -19,No such device

I tried with changing hdmi:0,2 with different numbers than 2 but then it
is just 'invalid argument'

although through 'aplay -L' I get:

default
    Playback/recording through the PulseAudio sound server
sysdefault:CARD=MID
    HDA Intel MID, CONEXANT Analog
    Default Audio Device
front:CARD=MID,DEV=0
    HDA Intel MID, CONEXANT Analog
    Front speakers
surround40:CARD=MID,DEV=0
    HDA Intel MID, CONEXANT Analog
    4.0 Surround output to Front and Rear speakers
surround41:CARD=MID,DEV=0
    HDA Intel MID, CONEXANT Analog
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=MID,DEV=0
    HDA Intel MID, CONEXANT Analog
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=MID,DEV=0
    HDA Intel MID, CONEXANT Analog
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=MID,DEV=0
    HDA Intel MID, CONEXANT Analog
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=MID,DEV=0
    HDA Intel MID, Conexant Digital
    IEC958 (S/PDIF) Digital Audio Output
hdmi:CARD=MID,DEV=0
    HDA Intel MID, HDMI 0
    HDMI Audio Output
hdmi:CARD=MID,DEV=1
    HDA Intel MID, HDMI 1
    HDMI Audio Output
hdmi:CARD=MID,DEV=2
    HDA Intel MID, HDMI 2
    HDMI Audio Output
dmix:CARD=MID,DEV=0
    HDA Intel MID, CONEXANT Analog
    Direct sample mixing device
dmix:CARD=MID,DEV=1
    HDA Intel MID, Conexant Digital
    Direct sample mixing device
dmix:CARD=MID,DEV=3
    HDA Intel MID, HDMI 0
    Direct sample mixing device
dmix:CARD=MID,DEV=7
    HDA Intel MID, HDMI 1
    Direct sample mixing device
dmix:CARD=MID,DEV=8
    HDA Intel MID, HDMI 2
    Direct sample mixing device
dsnoop:CARD=MID,DEV=0
    HDA Intel MID, CONEXANT Analog
    Direct sample snooping device
dsnoop:CARD=MID,DEV=1
    HDA Intel MID, Conexant Digital
    Direct sample snooping device
dsnoop:CARD=MID,DEV=3
    HDA Intel MID, HDMI 0
    Direct sample snooping device
dsnoop:CARD=MID,DEV=7
    HDA Intel MID, HDMI 1
    Direct sample snooping device
dsnoop:CARD=MID,DEV=8
    HDA Intel MID, HDMI 2
    Direct sample snooping device
hw:CARD=MID,DEV=0
    HDA Intel MID, CONEXANT Analog
    Direct hardware device without any conversions
hw:CARD=MID,DEV=1
    HDA Intel MID, Conexant Digital
    Direct hardware device without any conversions
hw:CARD=MID,DEV=3
    HDA Intel MID, HDMI 0
    Direct hardware device without any conversions
hw:CARD=MID,DEV=7
    HDA Intel MID, HDMI 1
    Direct hardware device without any conversions
hw:CARD=MID,DEV=8
    HDA Intel MID, HDMI 2
    Direct hardware device without any conversions
plughw:CARD=MID,DEV=0
    HDA Intel MID, CONEXANT Analog
    Hardware device with all software conversions
plughw:CARD=MID,DEV=1
    HDA Intel MID, Conexant Digital
    Hardware device with all software conversions
plughw:CARD=MID,DEV=3
    HDA Intel MID, HDMI 0
    Hardware device with all software conversions
plughw:CARD=MID,DEV=7
    HDA Intel MID, HDMI 1
    Hardware device with all software conversions
plughw:CARD=MID,DEV=8
    HDA Intel MID, HDMI 2
    Hardware device with all software conversions

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https://bugs.launchpad.net/bugs/1169836

Title:
  [Asus U50F, Intel IbexPeak HDMI, Digital Out, HDMI] No sound hdmi
  output

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