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-rw-r--r--Documentation/sound/alsa-configuration.rst13
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/sound/alsa-configuration.rst b/Documentation/sound/alsa-configuration.rst
index af71c68f1e4e..829c672d9fe6 100644
--- a/Documentation/sound/alsa-configuration.rst
+++ b/Documentation/sound/alsa-configuration.rst
@@ -133,6 +133,19 @@ enable
enable card;
Default: enabled, for PCI and ISA PnP cards
+These options are used for either specifying the order of instances or
+controlling enabling and disabling of each one of the devices if there
+are multiple devices bound with the same driver. For example, there are
+many machines which have two HD-audio controllers (one for HDMI/DP
+audio and another for onboard analog). In most cases, the second one is
+in primary usage, and people would like to assign it as the first
+appearing card. They can do it by specifying "index=1,0" module
+parameter, which will swap the assignment slots.
+
+Today, with the sound backend like PulseAudio and PipeWire which
+supports dynamic configuration, it's of little use, but that was a
+help for static configuration in the past.
+
Module snd-adlib
----------------