Public bug reported:
I installed Ubuntu 10.4 alpha 3 on a MacBook Pro 4.1.
$ lspci | grep Audio
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio
Controller (rev 03)
The sound output was very low in line out. Could not hear anything in
the internal speakers. Turned on everything in alsamixer.
Then I added the line "options snd_hda_intel model=mbp3" to
/etc/modprobe.d/options and everything worked fine after a restart.
$ grep "^Codec\|^Vendor Id\|^Subsystem Id\|^Revision Id"
/proc/asound/card0/codec#0
Codec: Realtek ALC889A
Vendor Id: 0x10ec0885
Subsystem Id: 0x106b3a00
Revision Id: 0x100103
ProblemType: Bug
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21.
Architecture: i386
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: tomi 6091 F.... pulseaudio
Card0.Amixer.info:
Card hw:0 'Intel'/'HDA Intel at 0x9b500000 irq 20'
Mixer name : 'Realtek ALC889A'
Components : 'HDA:10ec0885,106b3a00,00100103'
Controls : 33
Simple ctrls : 19
Date: Thu Mar 18 16:50:05 2010
DistroRelease: Ubuntu 10.04
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Alpha i386 (20100224.1)
NonfreeKernelModules: wl nvidia
Package: alsa-base 1.0.22.1+dfsg-0ubuntu3
PackageArchitecture: all
ProcEnviron:
LANG=de_DE.utf8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-14.20-generic
SourcePackage: alsa-driver
Uname: Linux 2.6.32-14-generic i686
** Affects: alsa-driver (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug i386 lucid
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sound output very quiet
https://bugs.launchpad.net/bugs/541016
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