Comment 6 for bug 481058

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Daniel T Chen (crimsun) wrote : Re: sound doesn't work since karmic update

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.