Default time-out for HD-audio power-save mode

DasFox · 04-23-2012, 12:27 AM

The 'Default time-out for HD-audio power-save mode', kernel help section says;

The default time-out value in seconds for HD-audio automatic power-save mode. 0 means to disable the power-save mode.

What I don't understand is that in the pm-utils there is the intel-audio-powersave which will enable or diable it;

Code:

#!/bin/sh

# Allow the driver to put the audio hardware to sleep
# once the driver has been inactive for a second.
# This hook should work with at least the ac97 and hda codecs.

INTEL_AUDIO_POWERSAVE=${INTEL_AUDIO_POWERSAVE:-true}

help() {
cat <<EOF
--------
$0: Intel Audio powersave parameters.

This hook has 1 tuneable parameter.
INTEL_AUDIO_POWERSAVE = controls whether we will try to save power on battery.
Defaults to true.

EOF
}

audio_powersave() {
    [ "$INTEL_AUDIO_POWERSAVE" = "true" ] || exit $NA
    for dev in /sys/module/snd_*; do
        [ -w "$dev/parameters/power_save" ] || continue
        printf "Setting power savings for %s to %d..." "${dev##*/}" "$1"
        echo $1 > "$dev/parameters/power_save" && echo Done. || echo Failed.
    done
}

case $1 in
    true) audio_powersave 1 ;;
    false) audio_powersave 0 ;;
    help) help;;
    *) exit $NA
esac

exit 0

So in order to use intel-audio-powersave, I assumed I would compile in the kernel support 'Aggressive power-saving on HD-audio' - CONFIG_SND_HDA_POWER_SAVE: but then I'm confused should I leave the 'Default time-out for HD-audio power-save mode' on 0 for the kernel?

THANKS