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authorTakashi Iwai <tiwai@suse.de>2011-09-28 17:16:09 +0200
committerTakashi Iwai <tiwai@suse.de>2011-09-28 20:11:36 +0200
commit27fe48d97291e61e76e87c34c9b89032e70d05c0 (patch)
treed58fd4e93728bedd87321eb11654601c0a02a24c /Documentation/sound/alsa
parent18a2b9623370479d1646b9b94e3528683f3b74de (diff)
ALSA: hda - Add snoop option
Added a new option "snoop" for the traffic control of the HD-audio controller chip. When set to 0, the non-snooping mode is used with the traffic control bit is set in each stream control register. This may allow better operations in the low power mode, but the actual implementation is depending pretty much on the chipset. As already implemented, more or less each chipset has own snoop-control register bit. Now this setup refers to the snoop option, too. Also, a new VIA chipset may require the non-snooping mode when set so in BIOS. In such a case, the option value is overridden. As default, it's still set to snoop=1 for keeping the same behavior as before. In near future, it'll be set to 0 as default after checking it works in every system well. Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'Documentation/sound/alsa')
-rw-r--r--Documentation/sound/alsa/ALSA-Configuration.txt1
1 files changed, 1 insertions, 0 deletions
diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt
index 27126c469f7..936699e4f04 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -891,6 +891,7 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
access but isn't required by the HDA spec and prevents
users from specifying exact period/buffer sizes.
(default = on)
+ snoop - Enable/disable snooping (default = on)
This module supports multiple cards and autoprobe.