[alsa-devel] [PATCH] ALSA: HDA: Use LPIB position fix for Macbook Pro 7, 1

David Henningsson david.henningsson at canonical.com
Fri Jan 13 09:55:56 CET 2012

On 2012-01-13 09:50, Takashi Iwai wrote:
> At Thu, 12 Jan 2012 16:31:14 +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 at kernel.org (v3.2+)
>> BugLink: https://bugs.launchpad.net/bugs/909419
>> Signed-off-by: David Henningsson<david.henningsson at canonical.com>
> Applied now.  Thanks.


Just a thought...this was reported as working better under the previous 
Ubuntu release, which run kernel 3.0 (and not too many changes in 
PulseAudio), i e, a regression. While I haven't done any serious kernel 
bisection of this, I know you've being doing some work with the 
snoop/non-snoop stuff lately, which I haven't followed closely. Do you 
think this can be related to why we're seeing broken position values 
when we're using the DMA position buffer map on some machines?

David Henningsson

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