Comment 23 for bug 420447

I didn't see any ALSA messages in your boot log so it isn't initializing fully. A section of my bootlog is below. Have you tried it with the sound driver built in? All my testing is using the imx51_defconfig that is in your kernel tree, so the audio is built in, not as modules.

I tested with on babbage 2.5 fsl rootfs (not ubuntu) and the audio is coming up and functioning.

boot messages:
Advanced Linux Sound Architecture Driver Version 1.0.20.
sgtl5000-i2c 1-000a: SGTL5000 revision 17
DMA Sound Buffers Allocated:UseIram=1 buf->addr=1ffef000 buf->area=de8a8000 size=24576
DMA Sound Buffers Allocated:UseIram=1 buf->addr=ac260000 buf->area=fbe03000 size=24576
asoc: SGTL5000 <-> imx-ssi-3 mapping ok
mmc0: new high speed SDHC card at address 8fe4
mmcblk0: mmc0:8fe4 SU08G 7.40 GiB
 mmcblk0: p1 p2
ALSA device list:
  #0: imx-3stack (SGTL5000)