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CONFIG_SND_AC97_POWER_SAVE: AC97 Power-Saving Mode

General informations

The Linux kernel configuration item CONFIG_SND_AC97_POWER_SAVE has multiple definitions:

AC97 Power-Saving Mode found in sound/drivers/Kconfig

The configuration item CONFIG_SND_AC97_POWER_SAVE:

Help text

Say Y here to enable the aggressive power-saving support of AC97 codecs. In this mode, the power-mode is dynamically controlled at each open/close.

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.

AC97 Power-Saving Mode found in sound/pci/Kconfig

The configuration item CONFIG_SND_AC97_POWER_SAVE:

Help text

Say Y here to enable the aggressive power-saving support of 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.

Hardware

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