Comment 17 for bug 909419

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