Choppy sound in Precise with MacBook Pro 7,1

[Mattias Bengtsson]

When running a recent daily ISO of Precise I get choppy sound and video playback. This did not occur in Oneiric. I tested using the video and audio-files in the example-contents folder. It can also be tested with
$ speaker-test -D pulse -t sine -c 2

I was able to workaround the problem by using the position_fix when loading the sound-driver.

$ sudo killall pulseaudio
$ sudo modprobe -r snd-hda-intel
$ sudo modprobe snd-hda-intel position_fix=1

The problem reoccured when loading the driver without the position_fix-parameter.

$ sudo killall pulseaudio
$ sudo modprobe -r snd-hda-intel
$ sudo modprobe snd-hda-intel

I'm using a MacBook Pro 7,1 (mid 2010)

$ lsb_release -rd
Description: Ubuntu precise (development branch)
Release: 12.04

$ lspci -nn | grep Audio
00:08.0 Audio device [0403]: nVidia Corporation MCP89 High Definition Audio [10de:0d94] (rev a2)

Let me know if there is anything else I can do to help fix this bug.

Thanks,
Mattias

[Mattias Bengtsson (benmat)]

I just found another bug that this might be a duplicate of #909419.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[spaetz (spaetz)]

Same model, same problem. Oneiric worked fine. Precise not.
Linux spaetzbook 3.2.0-8-generic #14-Ubuntu SMP Fri Jan 6 01:56:48 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux