Public bug reported:

I have a macbook pro 4,1 I have no audio.

ProblemType: Bug
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
Architecture: amd64
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/dsp', 
'/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D0', 
'/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/pcmC0D1c', 
'/dev/snd/pcmC0D1p', '/dev/snd/pcmC0D2c', '/dev/snd/seq', '/dev/snd/timer', 
'/dev/sequencer2', '/dev/sequencer'] failed with exit code 1:
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xdb500000 irq 20'
   Mixer name   : 'Realtek ALC889A'
   Components   : 'HDA:10ec0885,106b3800,00100103'
   Controls      : 33
   Simple ctrls  : 19
Date: Sat Mar 27 18:20:03 2010
DistroRelease: Ubuntu 10.04
LiveMediaBuild: Ubuntu 10.04 "Lucid Lynx" - Alpha amd64 (20100327)
NonfreeKernelModules: wl
Package: alsa-base 1.0.22.1+dfsg-0ubuntu3
PackageArchitecture: all
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-17.26-generic 2.6.32.10+drm33.1
SourcePackage: alsa-driver
Uname: Linux 2.6.32-17-generic x86_64

** Affects: alsa-driver (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug lucid

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No audio comes out of my speakers
https://bugs.launchpad.net/bugs/549937
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