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ALSA: HDA: Add position_fix=3 module option, and refactor related code

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What was previously known as via_dmapos_patch, and hard-coded to be
used for VIA and ATI controllers, is now configurable through a module
option. The background is that some VIA controllers seem to prefer
via_dmapos_patch to be turned off.

Signed-off-by: David Henningsson <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>
This commit is contained in:
David Henningsson 2010-09-30 10:12:50 +02:00 • committed by Takashi Iwai
commit 4cb3631084
2 changed files with 24 additions and 25 deletions
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8
Documentation/sound/alsa/HD-Audio.txt
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@ -57,9 +57,11 @@ dead. However, this detection isn't perfect on some devices. In such
a case, you can change the default method via `position_fix` option.
`position_fix=1` means to use LPIB method explicitly.
`position_fix=2` means to use the position-buffer. 0 is the default
value, the automatic check and fallback to LPIB as described in the
above. If you get a problem of repeated sounds, this option might
`position_fix=2` means to use the position-buffer.
`position_fix=3` means to use a combination of both methods, needed
for some VIA and ATI controllers. 0 is the default value for all other
controllers, the automatic check and fallback to LPIB as described in
the above. If you get a problem of repeated sounds, this option might
help.
In addition to that, every controller is known to be broken regarding