I get a workable kernel of panda from linaro landing team, and after set alsa 
mixer properly, the sound will play well.
amixer cset name='DL1 Mixer Multimedia' 1
amixer cset name='DL1 Media Playback Volume' 118
amixer cset name='Sidetone Mixer Playback' 1
amixer cset name='SDT DL Volume' 120
amixer cset name='DL1 PDM Switch' 1
amixer cset name='HS Left Playback' 'HS DAC'
amixer cset name='HS Right Playback' 'HS DAC'
amixer cset name='Headset Playback Volume' 13

I update the mixer setting into alsa ucm configurations of panda.
http://git.linaro.org/gitweb?p=people/weifeng/alsa-ucm-conf.git
BTW, in linaro release, i can't find udev rules for alsa-utils. So I'm not sure 
if "alsaucm set _verb HiFi" is called properly. In that case, you can call 
"sudo alsaucm set _verb HiFi" mannually

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https://bugs.launchpad.net/bugs/746023

Title:
  No sound on omap4

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