[ALSA] Add description about power-saving mode

Added the description about power-saving mode on AC97 and HD-audio drivers.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

1 files changed, 3 insertions, 6 deletions

diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt
index ef330715c6d6..9268925f8e42 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -770,7 +770,7 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed.
                 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)
+                disable)
     power_save_controller - Reset HD-audio controller in power-saving mode
                 (default = on)
 
@@ -1024,11 +1024,8 @@ 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.
+    power_save and power_save_controller options are for power-saving
+    mode.  See powersave.txt for details.
 
     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