I have the same bug. I can confirm that the 3.9 RC 7 kernel downloaded
from http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.9-rc7-raring/ does
fix the bug. Using this kernel now and HDMI audio works as before.


# uname -a
Linux universe 3.9.0-030900rc7-generic #201304171402 SMP Wed Apr 17 18:04:26 
UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

# pact list 
[...]
        Profiles:
                input:analog-stereo: Analog Stereo Input (sinks: 0, sources: 1, 
priority. 60)
                output:analog-stereo: Analog Stereo Output (sinks: 1, sources: 
0, priority. 6000)
                output:analog-stereo+input:analog-stereo: Analog Stereo Duplex 
(sinks: 1, sources: 1, priority. 6060)
                output:hdmi-stereo: Digital Stereo (HDMI) Output (sinks: 1, 
sources: 0, priority. 5400)
                output:hdmi-stereo+input:analog-stereo: Digital Stereo (HDMI) 
Output + Analog Stereo Input (sinks: 1, sources: 1, priority. 5460)
                off: Off (sinks: 0, sources: 0, priority. 0)

bdeak@universe:~$ cat /proc/asound/card0/codec*|grep Codec
Codec: Conexant CX20590
Codec: Intel PantherPoint HDMI

Thanks for the tip, Joseph!

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https://bugs.launchpad.net/bugs/1169761

Title:
  3.8.0-18 Kernel causes HDMI Audio to stop working

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