[Several MacBooks (with PCI SSID 10de:cb89)] Choppy sound. Videos play double speed

Killing pulseaudio stops the choppyness.

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

I've noticed this in precise as well, however, I don't think all video formats are affected

The following seems to fix/workaround the issue:-

Edit /etc/pulse/default.pa

Change:-

load-module module-udev-detect

to

load-module module-udev-detect tsched=0

Then restart pulse.

pulseaudio -k

Hi Alan,
Are you able to test video/audio playback out your DisplayPort/HDMI connection and see how the audio behaves?

In any case, could you try the following:

Add the following line to /etc/modprobe.d/alsa-base.conf

options snd-hda-intel position_fix=1

Save, and reboot, and try playing video again. If that doesn't help, please get a lot from PulseAudio, as explained here: https://wiki.ubuntu.com/PulseAudio/Log.

Thanks.

I forgot to add that you should also remove tsched=0 from the pulse configuration that you mentioned above.

I removed tsched=0 from the pulse config and added the position_fix=1 to alsa-base.conf and rebooted. This seems to have fixed it. I've played youtube (flash) videos and used Totem to play local videos and they play fine now. Thanks Luke.

Oh. forgot to say. I am unable to test displayport to hdmi because I only have a displayport to VGA adapter.

I just reported bug #913130 which looks like a dupe of this one. If that's the case I can confirm that loading the sound-driver with position_fix=1 works for me too.

position_fix=1 fixed this for mine as well.

Just sent a patch upstream for this issue: http://mailman.alsa-project.org/pipermail/alsa-devel/2012-January/048043.html
If anybody wants to pick it up for 12.04 before it comes down the normal path (might take a month or two!), feel free to do so.

Upstream accepted/applied patch.

Several users have reported "choppy" audio under the 3.2 kernel,
and that changing position_fix to 1 has resolved their problem.
The chip is an nVidia Corporation MCP89 High Definition Audio,
[10de:0d94] (rev a2).

Cc: <email address hidden> (v3.2+)
BugLink: https://bugs.launchpad.net/bugs/909419
Signed-off-by: David Henningsson <email address hidden>
Signed-off-by: Takashi Iwai <email address hidden>
(cherry picked from commit b01de4fb40137fbda7530550ff0cd37171dafb0c,
git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git)
---

 * Several macbooks (with the same ID, see duplicates to bug 909419)
   seem to be hitting this one, so it might be worth picking it for
   our next upload, instead of waiting for stable.

 sound/pci/hda/hda_intel.c | 1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index c2f79e6..5b2b75b 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -2509,6 +2509,7 @@ static struct snd_pci_quirk position_fix_list[] __devinitdata = {
  SND_PCI_QUIRK(0x1043, 0x81e7, "ASUS M2V", POS_FIX_LPIB),
  SND_PCI_QUIRK(0x1043, 0x83ce, "ASUS 1101HA", POS_FIX_LPIB),
  SND_PCI_QUIRK(0x104d, 0x9069, "Sony VPCS11V9E", POS_FIX_LPIB),
+ SND_PCI_QUIRK(0x10de, 0xcb89, "Macbook Pro 7,1", POS_FIX_LPIB),
  SND_PCI_QUIRK(0x1297, 0x3166, "Shuttle", POS_FIX_LPIB),
  SND_PCI_QUIRK(0x1458, 0xa022, "ga-ma770-ud3", POS_FIX_LPIB),
  SND_PCI_QUIRK(0x1462, 0x1002, "MSI Wind U115", POS_FIX_LPIB),
--
1.7.8.3

I have downgraded the kernel to 3.0.0-15. It sounded worse than 3.2.0
I've rebuilt pulseaudio 1:1.0-0ubuntu3.1 on precise. The sound was good

On 13.01.2012 12:42, David Henningsson wrote:
> Several users have reported "choppy" audio under the 3.2 kernel,
> and that changing position_fix to 1 has resolved their problem.
> The chip is an nVidia Corporation MCP89 High Definition Audio,
> [10de:0d94] (rev a2).
>
> Cc: <email address hidden> (v3.2+)
> BugLink: https://bugs.launchpad.net/bugs/909419
> Signed-off-by: David Henningsson <email address hidden>
> Signed-off-by: Takashi Iwai <email address hidden>
> (cherry picked from commit b01de4fb40137fbda7530550ff0cd37171dafb0c,
> git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git)
> ---
>
> * Several macbooks (with the same ID, see duplicates to bug 909419)
> seem to be hitting this one, so it might be worth picking it for
> our next upload, instead of waiting for stable.
>
> sound/pci/hda/hda_intel.c | 1 +
> 1 files changed, 1 insertions(+), 0 deletions(-)
>
> diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
> index c2f79e6..5b2b75b 100644
> --- a/sound/pci/hda/hda_intel.c
> +++ b/sound/pci/hda/hda_intel.c
> @@ -2509,6 +2509,7 @@ static struct snd_pci_quirk position_fix_list[] __devinitdata = {
> SND_PCI_QUIRK(0x1043, 0x81e7, "ASUS M2V", POS_FIX_LPIB),
> SND_PCI_QUIRK(0x1043, 0x83ce, "ASUS 1101HA", POS_FIX_LPIB),
> SND_PCI_QUIRK(0x104d, 0x9069, "Sony VPCS11V9E", POS_FIX_LPIB),
> + SND_PCI_QUIRK(0x10de, 0xcb89, "Macbook Pro 7,1", POS_FIX_LPIB),
> SND_PCI_QUIRK(0x1297, 0x3166, "Shuttle", POS_FIX_LPIB),
> SND_PCI_QUIRK(0x1458, 0xa022, "ga-ma770-ud3", POS_FIX_LPIB),
> SND_PCI_QUIRK(0x1462, 0x1002, "MSI Wind U115", POS_FIX_LPIB),

Patch looks ok and is upstream and actually already queued up for the next
stable update. I guess that will happen soon as well.

-Stefan

On Fri, Jan 13, 2012 at 12:42:14PM +0100, David Henningsson wrote:
> Several users have reported "choppy" audio under the 3.2 kernel,
> and that changing position_fix to 1 has resolved their problem.
> The chip is an nVidia Corporation MCP89 High Definition Audio,
> [10de:0d94] (rev a2).
>
> Cc: <email address hidden> (v3.2+)
> BugLink: https://bugs.launchpad.net/bugs/909419
> Signed-off-by: David Henningsson <email address hidden>
> Signed-off-by: Takashi Iwai <email address hidden>
> (cherry picked from commit b01de4fb40137fbda7530550ff0cd37171dafb0c,
> git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git)
> ---
>
> * Several macbooks (with the same ID, see duplicates to bug 909419)
> seem to be hitting this one, so it might be worth picking it for
> our next upload, instead of waiting for stable.
>
> sound/pci/hda/hda_intel.c | 1 +
> 1 files changed, 1 insertions(+), 0 deletions(-)
>
> diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
> index c2f79e6..5b2b75b 100644
> --- a/sound/pci/hda/hda_intel.c
> +++ b/sound/pci/hda/hda_intel.c
> @@ -2509,6 +2509,7 @@ static struct snd_pci_quirk position_fix_list[] __devinitdata = {
> SND_PCI_QUIRK(0x1043, 0x81e7, "ASUS M2V", POS_FIX_LPIB),
> SND_PCI_QUIRK(0x1043, 0x83ce, "ASUS 1101HA", POS_FIX_LPIB),
> SND_PCI_QUIRK(0x104d, 0x9069, "Sony VPCS11V9E", POS_FIX_LPIB),
> + SND_PCI_QUIRK(0x10de, 0xcb89, "Macbook Pro 7,1", POS_FIX_LPIB),
> SND_PCI_QUIRK(0x1297, 0x3166, "Shuttle", POS_FIX_LPIB),
> SND_PCI_QUIRK(0x1458, 0xa022, "ga-ma770-ud3", POS_FIX_LPIB),
> SND_PCI_QUIRK(0x1462, 0x1002, "MSI Wind U115", POS_FIX_LPIB),

As this is so small and we are so near to the next milestone it would
probabally be good to pull this in as a pre-stable patch.

Acked-by: Andy Whitcroft <email address hidden>

-apw

This has also hit mainline so updated the commentary to match.

Applied to Precise.

-apw

This bug was fixed in the package linux - 3.2.0-10.18

---------------
linux (3.2.0-10.18) precise; urgency=low

  [ Tim Gardner ]

  * SAUCE: ecryptfs: Print inode on metadata error

  [ Upstream Kernel Changes ]

  * Revert "proc: enable writing to /proc/pid/mem"
    - LP: #919115
    - CVE-2012-0056
  * (pre-stable) ALSA: HDA: Use LPIB position fix for Macbook Pro 7, 1
    - LP: #909419
 -- Andy Whitcroft <email address hidden> Tue, 24 Jan 2012 10:15:12 +0000

I am still having this problem with 3.2.0-25.