Compute Stick baytrail audio problem

[Giacomo Comes <comes@naic.edu>]

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Hi,
I have recently bought a Intel Compute Stick and I am having trouble with the audio.
Intel provides a custom Ubuntu release that support audio, but I want to run the 
linux distribution of my choice on it (openSUSE 13.2 for the moment).

In order to have HDMI audio support it is necessary to compile a kernel with this patch
(https://raw.githubusercontent.com/01org/baytrailaudio/master/hdmi_audio_20150319.patch)
provided by Intel for kernel 3.16.7 (https://01.org/ubuntu-hdmi)

I compiled the openSUSE kernel using the default openSUSE .config plus the following:
CONFIG_SUPPORT_HDMI=y
CONFIG_SND_SOC=m
CONFIG_SND_SOC_INTEL_SST=m
CONFIG_SND_SOC_INTEL_BYT_RT5640_MACH=m

I booted the new kernel and aplay -l gives this output:
**** List of PLAYBACK Hardware Devices ****
card 0: IntelHDMI [IntelHDMI], device 0: IntelHDMI [IntelHDMI]
  Subdevices: 0/1
  Subdevice #0: subdevice #0

but when I run:
  aplay /usr/share/sounds/alsa/test.wav
the audio plays for .2 seconds and then nothing more.
Sometime it will play later a little bit more and stop again.
At some point these messages appears:
underrun!!! (at least 29325.946 ms long)
underrun!!! (at least 1535.889 ms long)
underrun!!! (at least 3196.213 ms long)


I have looked around on google for a hint on how to fix this issue but I found nothing.
Any idea where to look for a solution?

Attached there are the dmesg and lsmod output for ubuntu
with the working audio and openSUSE 13.2 plus patch
without the working audio.
I can provide any other information you need.

Thanks for any help.
Giacomo

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