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Text File  |  2012-05-20  |  2.2 KB  |  56 lines
  1. #! /bin/sh
  2. # 
  3. # Laptop mode tools module: Intel HDA integrated audio power saving mode.
  4. #
  5.  
  6. if [ x$CONTROL_INTEL_HDA_POWER = x1 ]  || [ x$ENABLE_AUTO_MODULES = x1 -a x$CONTROL_INTEL_HDA_POWER = xauto ]; then
  7.     if [ $ON_AC -eq 1 ]; then
  8.         if [ "$ACTIVATE" -eq 1 ]; then
  9.             INTEL_HDA_POWERSAVE="$LM_AC_INTEL_HDA_POWERSAVE"
  10.         else
  11.             INTEL_HDA_POWERSAVE="$NOLM_AC_INTEL_HDA_POWERSAVE"
  12.         fi
  13.     else
  14.         INTEL_HDA_POWERSAVE="$BATT_INTEL_HDA_POWERSAVE"
  15.     fi
  16.  
  17.     # Handle Intel HDA Power Save
  18.     if [ -w /sys/module/snd_hda_intel/parameters/power_save ]; then
  19.         if [ x$INTEL_HDA_POWERSAVE = x1 ]; then
  20.                 echo $INTEL_HDA_DEVICE_TIMEOUT > /sys/module/snd_hda_intel/parameters/power_save
  21.                 log "VERBOSE" "Intel HDA power save mode enabled with timeout $INTEL_HDA_DEVICE_TIMEOUT."
  22.                 if [ -c /dev/dsp ]; then
  23.                     # This can fail if the audio device is busy.
  24.                     # Since this failure is non-fatal (worst case is that the timer changes
  25.                     # don't get activated), we don't bother if it was successful or not
  26.                     #(exec 2>/dev/null; echo 1 > /dev/dsp;)
  27.                     # Better way
  28.                     echo 1 2>/dev/null >/dev/dsp
  29.                     log "VERBOSE" "Initialize timer change by close/open /dev/dsp"
  30.                 fi
  31.         else
  32.                 echo 0 > /sys/module/snd_hda_intel/parameters/power_save
  33.                 log "VERBOSE" "Intel HDA power save mode disabled."
  34.         fi
  35.     else
  36.             log "VERBOSE" "Intel HDA power saving is not available on this system."
  37.     fi
  38.  
  39.     # Handle Intel HDA Controller Power Savings.
  40.     if [ x$INTEL_HDA_DEVICE_CONTROLLER = x1 -a x$INTEL_HDA_POWERSAVE = x1 ]; then
  41.         POWER_SAVE="Y"
  42.     else
  43.         POWER_SAVE="N"
  44.     fi
  45.  
  46.     if [ -w /sys/module/snd_hda_intel/parameters/power_save_controller ]; then
  47.         echo $POWER_SAVE > /sys/module/snd_hda_intel/parameters/power_save_controller
  48.         log "VERBOSE" "Intel HDA Controller power save set to $POWER_SAVE."
  49.     else
  50.         log "VERBOSE" "Sound Card doesn't seem to support Controller Power Save."
  51.     fi
  52. else
  53.     log "VERBOSE" "Intel HDA audio power setting is disabled."
  54. fi
  55.  
  56.