>From your BootDmesg.txt:

[   18.460034] AC'97 1 does not respond - RESET
[   18.460239] AC'97 1 access is not valid [0xffffffff], removing mixer.
[   18.460245] Unable to initialize codec #1

Please try disabling PA autospawn (as documented at
https://wiki.ubuntu.com/PulseAudio/Log), doing sudo alsa force-reload,
then reenabling PA autospawn.

-- 
sound doesn't work since karmic update
https://bugs.launchpad.net/bugs/481058
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