(precise pre-stable) [PATCH] ALSA: HDA: Use LPIB position fix for Macbook Pro 7, 1

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: stable@kernel.org (v3.2+)
BugLink: https://bugs.launchpad.net/bugs/909419
Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
(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(-)

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: stable@kernel.org (v3.2+)
> BugLink: https://bugs.launchpad.net/bugs/909419
> Signed-off-by: David Henningsson <david.henningsson@canonical.com>
> Signed-off-by: Takashi Iwai <tiwai@suse.de>
> (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: stable@kernel.org (v3.2+)
> BugLink: https://bugs.launchpad.net/bugs/909419
> Signed-off-by: David Henningsson <david.henningsson@canonical.com>
> Signed-off-by: Takashi Iwai <tiwai@suse.de>
> (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 <apw@canonical.com>

-apw

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

Applied to Precise.

-apw