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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: Michael Witten <mfwitten@gmail.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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@ -170,9 +170,25 @@ config SND_AC97_POWER_SAVE
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AC97 codecs. In this mode, the power-mode is dynamically
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AC97 codecs. In this mode, the power-mode is dynamically
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controlled at each open/close.
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controlled at each open/close.
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The mode is activated by passing power_save=1 option to
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The mode is activated by passing 'power_save=X' to the
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snd-ac97-codec driver. You can toggle it dynamically over
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snd-ac97-codec driver module, where 'X' is the time-out
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sysfs, too.
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value, a nonnegative integer that specifies how many
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seconds of idle time the driver must count before it may
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put the AC97 into power-save mode; a value of 0 (zero)
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disables the use of this power-save mode.
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After the snd-ac97-codec driver module has been loaded,
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the 'power_save' parameter can be set via sysfs as follows:
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echo 10 > /sys/module/snd_ac97_codec/parameters/power_save
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In this case, the time-out is set to 10 seconds; setting
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the time-out to 1 second (the minimum activation value)
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isn't recommended because many applications try to reopen
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the device frequently. A value of 10 seconds would be a
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good choice for normal operations.
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See Documentation/sound/alsa/powersave.txt for more details.
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config SND_AC97_POWER_SAVE_DEFAULT
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config SND_AC97_POWER_SAVE_DEFAULT
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int "Default time-out for AC97 power-save mode"
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int "Default time-out for AC97 power-save mode"
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@ -182,4 +198,6 @@ config SND_AC97_POWER_SAVE_DEFAULT
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The default time-out value in seconds for AC97 automatic
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The default time-out value in seconds for AC97 automatic
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power-save mode. 0 means to disable the power-save mode.
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power-save mode. 0 means to disable the power-save mode.
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See SND_AC97_POWER_SAVE for more details.
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endif # SND_DRIVERS
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endif # SND_DRIVERS
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