| #! /bin/sh |
| # |
| # Laptop mode tools module: Intel AC97 integrated audio power saving mode. |
| # |
| |
| if [ x$CONTROL_AC97_POWER = x1 ] ; then |
| if [ -w /sys/module/snd_ac97_codec/parameters/power_save ]; then |
| echo 1 > /sys/module/snd_ac97_codec/parameters/power_save |
| log "VERBOSE" "AC97 power save mode enabled." |
| if [ -c /dev/dsp ]; then |
| # This can fail if the audio device is busy. |
| # Since this failure is non-fatal (worst case is that the timer changes |
| # don't get activated), we don't bother if it was successful or not |
| #(exec 2>/dev/null; echo 1 > /dev/dsp;) |
| # Better way |
| echo 1 2>/dev/null >/dev/dsp |
| log "VERBOSE" "Initialize timer change by close/open /dev/dsp" |
| fi |
| else |
| log "VERBOSE" "AC97 power saving is not available. Perhaps CONFIG_SND_AC97_POWER_SAVE option" |
| log "VERBOSE" "is not set in the kernel config, or the snd_ac97_codec module is not loaded." |
| fi |
| else |
| log "VERBOSE" "AC97 audio power setting is disabled." |
| fi |
| |
