Commit 1d8c1100 authored by Michael Witten's avatar Michael Witten Committed by Takashi Iwai
Browse files

ALSA: Kconfig: SND_AC97_POWER_SAVE description improvement 



The description has been expanded to explain the time-out
value provided by the power_save module parameter.

Signed-off-by: default avatarMichael Witten <mfwitten@gmail.com>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 992cbf74

sound/drivers/Kconfig

+21 −3
Original line number Diff line number Diff line
@@ -170,9 +170,25 @@ config SND_AC97_POWER_SAVE 
	  AC97 codecs.  In this mode, the power-mode is dynamically

	  controlled at each open/close.



	  The mode is activated by passing power_save=1 option to

	  snd-ac97-codec driver.  You can toggle it dynamically over

	  sysfs, too.

	  The mode is activated by passing 'power_save=X' to the

	  snd-ac97-codec driver module, where 'X' is the time-out

	  value, a nonnegative integer that specifies how many

	  seconds of idle time the driver must count before it may

	  put the AC97 into power-save mode;  a value of 0 (zero)

	  disables the use of this power-save mode.



	  After the snd-ac97-codec driver module has been loaded,

	  the 'power_save' parameter can be set via sysfs as follows:



	    echo 10 > /sys/module/snd_ac97_codec/parameters/power_save



	  In this case, the time-out is set to 10 seconds; setting

	  the time-out to 1 second (the minimum activation value)

	  isn't recommended because many applications try to reopen

	  the device frequently.  A value of 10 seconds would be a

	  good choice for normal operations.



	  See Documentation/sound/alsa/powersave.txt for more details.



config SND_AC97_POWER_SAVE_DEFAULT

	int "Default time-out for AC97 power-save mode"
@@ -182,4 +198,6 @@ config SND_AC97_POWER_SAVE_DEFAULT 
	  The default time-out value in seconds for AC97 automatic

	  power-save mode.  0 means to disable the power-save mode.



	  See SND_AC97_POWER_SAVE for more details.



endif	# SND_DRIVERS