1 files changed, 10 insertions, 0 deletions

diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt
index f71ed680d33c..2bdabe23bc70 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -768,6 +768,10 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
     single_cmd  - Use single immediate commands to communicate with
                 codecs (for debugging only)
     enable_msi  - Enable Message Signaled Interrupt (MSI) (default = off)
+    power_save  - Automatic power-saving timtout (in second, 0 =
+                disable, default = 10)
+    power_save_controller - Reset HD-audio controller in power-saving mode
+                (default = on)
 
     This module supports one card and autoprobe.
 
@@ -993,6 +997,12 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
     subsystem ID (output of "lspci -nv") to ALSA BTS or alsa-devel
     ML (see the section "Links and Addresses").
 
+    When CONFIG_SND_HDA_POWER_SAVE is set, two options, power_save and
+    power_save_controller become available.  power_save specifies the
+    time to turn off the power automatically at idle status.  When
+    power_save_controller is true, the controller is also turned off.
+    This might result in more obvious click noise at turning on/off.
+
     Note 2: If you get click noises on output, try the module option
             position_fix=1 or 2.  position_fix=1 will use the SD_LPIB
             register value without FIFO size correction as the current