[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>
diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt
index ef33071..9268925 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -770,7 +770,7 @@
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 @@
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