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authorDavid Henningsson <david.henningsson@canonical.com>2010-09-30 10:12:50 +0200
committerTakashi Iwai <tiwai@suse.de>2010-09-30 14:16:11 +0200
commit4cb36310848fd17766aa72afd1f2873f54b4e055 (patch)
treebdd58b3ab4085de265086417d0dbcc53a31eeb45 /Documentation/sound
parentc123e5e437a0e61e364c1cbad3ef9a7384975fb2 (diff)
ALSA: HDA: Add position_fix=3 module option, and refactor related code
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 <david.henningsson@canonical.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'Documentation/sound')
-rw-r--r--Documentation/sound/alsa/HD-Audio.txt8
1 files changed, 5 insertions, 3 deletions
diff --git a/Documentation/sound/alsa/HD-Audio.txt b/Documentation/sound/alsa/HD-Audio.txt
index 278cc2122ea..c82beb00763 100644
--- a/Documentation/sound/alsa/HD-Audio.txt
+++ b/Documentation/sound/alsa/HD-Audio.txt
@@ -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