No Sound: ALSA doesn't properly detect macbook pro 3,1

Bug #332456 reported by Nick Semenkovich on 2009-02-21
This bug affects 2 people
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
Manoj Iyer
Nominated for Jaunty by Nick Semenkovich

Bug Description

Binary package hint: alsa-base

In the current alsa-base on Jaunty, the MacBook Pro's soundcard isn't appropriately detected.

This results in no sound and a constant illumination of the SPDIF mode of the headphone jack.

To fix the problem, one must add: "options snd_hda_intel model=mbp3" to /etc/modprobe.d/alsa-base

# dmidecode -s system-product-name

# apt-cache policy alsa-base
  Installed: 1.0.18.dfsg-1ubuntu3
  Candidate: 1.0.18.dfsg-1ubuntu3
  Version table:
 *** 1.0.18.dfsg-1ubuntu3 0
        500 jaunty/main Packages
        100 /var/lib/dpkg/status

Nick Semenkovich (semenko) wrote :

Attached is the ./ script AFTER I updated /etc/modprobe.d/alsa-base and sound works.

As an aside, the default volume for "FRONT" seemed to be so low that the volume keys on the keyboard only really matter at the highest few settings (beyond that, the volume was effectively zero, until "FRONT" was cranked up).

Luke Yelavich (themuso) on 2009-02-23
Changed in alsa-driver:
assignee: nobody → ubuntu-audio
status: New → Triaged

I have sent a fix for this upstream, which will probably make it to the Ubuntu Jaunty kernel at some point. If it doesn't get into the Jaunty kernel in the next few weeks, I'll request the kernel team add it themselves.

Thanks for the report.

Please do also see this bug report: Maybe they are related?

Nick Semenkovich (semenko) wrote :


Did this make it into 2.6.28-9?


Luke Yelavich (themuso) wrote :

I requested that my fix be pulled into the Ubuntu kernel, however it appears it hasn't yet. I've prodded the appropriate people to get it sorted.

Thanks Luke. Also just adding the upstream git commit id for the kernel team to reference here:

commit 2d4663816064fabb68935f920bbd7ccdc7f9392d
Author: Luke Yelavich <email address hidden>
Date: Mon Feb 23 13:00:33 2009 +1100

    ALSA: hda - add another MacBook Pro 3,1 SSID

    Reference: Ubuntu bug #33245

    Signed-off-by: Luke Yelavich <email address hidden>
    Signed-off-by: Takashi Iwai <email address hidden>

Manoj Iyer (manjo) wrote :

Please try test kernel at

and report results back here.

Changed in linux:
assignee: ubuntu-audio → manjo
Manoj Iyer (manjo) on 2009-03-17
Changed in linux:
status: Triaged → Incomplete
Luke Yelavich (themuso) wrote :

The patch for this bug is already in the Ubuntu kernel, so this should be marked fixed if the reporter is able to use audio without extra options in /etc/modprobe.d/alsa-base.conf.

Andy Whitcroft (apw) on 2009-03-23
Changed in linux:
importance: Undecided → Low
Manoj Iyer (manjo) wrote :

ALSA: hda - add another MacBook Pro 3,1 SSID
is in Ubuntu Jaunty kernel.

Changed in linux (Ubuntu):
status: Incomplete → Fix Released

exactly the same problem. model=mbp3 works!

$ sudo dmidecode -s system-product-name

$ cat /etc/lsb-release $

cat /proc/asound/card0/codec#* | grep Codec
Codec: Realtek ALC889A

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