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-rw-r--r--Documentation/sound/alsa/HD-Audio.txt5
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/sound/alsa/HD-Audio.txt b/Documentation/sound/alsa/HD-Audio.txt
index f4dd3bf99d12..ecacf53a8655 100644
--- a/Documentation/sound/alsa/HD-Audio.txt
+++ b/Documentation/sound/alsa/HD-Audio.txt
@@ -196,6 +196,11 @@ generic parser regardless of the codec. Usually the codec-specific
parser is much better than the generic parser (as now). Thus this
option is more about the debugging purpose.
+Another special meaning has 'model=hwio'. For this model, the driver
+bypasses any codec initialization and the reset procedure for codecs
+is also bypassed. This mode is usefull to enable direct access using
+hwdep interface (using hdaverb or hda-analyzer tools) and retain
+codec setup from BIOS.
Speaker and Headphone Output
~~~~~~~~~~~~~~~~~~~~~~~~~~~~