No Sound on Macbook 7,1 on uptodate Maverick installation

Bug #647389 reported by Benjamin Bender on 2010-09-25
This bug affects 6 people
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
Luke Yelavich

Bug Description

Soundcard is recocnized - but no sound is playing. All Channels are up in alsamixer & gnome-sound-prefs. Hardware is a 13" Macbook Pro 7,1.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: alsa-base 1.0.23+dfsg-1ubuntu4
ProcVersionSignature: Ubuntu 2.6.35-22.33-generic
Uname: Linux 2.6.35-22-generic x86_64
NonfreeKernelModules: nvidia wl
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: amd64
 **** List of CAPTURE Hardware Devices ****
 card 0: NVidia [HDA NVidia], device 0: Cirrus Analog [Cirrus Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
 /dev/snd/controlC0: bb 18881 F.... pulseaudio
 Card hw:0 'NVidia'/'HDA NVidia at 0xd3480000 irq 23'
   Mixer name : 'Nvidia MCP89 HDMI'
   Components : 'HDA:10134206,106b0d00,00100301 HDA:10de000c,10de0101,00100200'
   Controls : 28
   Simple ctrls : 12
CheckboxCommand: gst_pipeline_test -t 2 'audiotestsrc wave=sine freq=512 ! audioconvert ! audioresample ! gconfaudiosink'
 Klicken Sie auf »Testen«, um einen Ton über das automatisch erkannte Wiedergabe-Gerät abzuspielen.

 Do you hear a sound and was that sound free of any distortion, clicks or other strange noises?
CheckboxTest: playback_auto
Date: Sat Sep 25 11:41:39 2010
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Alpha amd64 (20100908)
PackageArchitecture: all
SourcePackage: alsa-driver 03/25/10
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MBP71.88Z.0039.B05.1003251322 Mac-F222BEC8
dmi.board.vendor: Apple Inc.
dmi.chassis.type: 10
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-F222BEC8
dmi.modalias: dmi:bvnAppleInc.:bvrMBP71.88Z.0039.B05.1003251322:bd03/25/10:svnAppleInc.:pnMacBookPro7,1:pvr1.0:rvnAppleInc.:rnMac-F222BEC8:rvr:cvnAppleInc.:ct10:cvrMac-F222BEC8: MacBookPro7,1
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.

Benjamin Bender (benben) wrote :
description: updated
Rees George (rgeorge280) wrote :

By following the instructions under the sound section here: I was able to get sound working.

Thanks for the pointer, I'll go ahead and make that a perminent fix, i.e the module model=mbp55 step will no longer be needed for future kernel updates in natty, and possibly maverick.

Luke Yelavich (themuso) on 2010-10-05
affects: alsa-driver (Ubuntu) → linux (Ubuntu)
Changed in linux (Ubuntu):
assignee: nobody → Luke Yelavich (themuso)
status: New → In Progress
Mark Smith (tntc-tig) wrote :

I took a look at alsamixer, and it would seem that Alsa thinks that my left speaker is actually my front speaker, and the right is another surround speaker. This is probably why audio is so quiet and distorted.

Julian Wiedmann (jwiedmann) wrote :
Changed in linux (Ubuntu):
status: In Progress → Fix Released
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