Power saving script

energy.sh

#!/bin/bash

####
# Configuration
####

SOUND_POWERSAVE_BATTERY=1
SOUND_POWERSAVE_AC=0

WIFI_IFNAME="wlp4s0"
WIFI_POWERSAVE_BATTERY="on"
WIFI_POWERSAVE_AC="off"

# ondemand      Dynamically switch between CPU(s) available if at 95% cpu load
# performance   Run the cpu at max frequency
# conservative  Dynamically switch between CPU(s) available if at 75% load
# powersave     Run the cpu at the minimum frequency
# userspace     Run the cpu at user specified frequencies
CPU_GOVERNOR_BATTERY=powersave
CPU_GOVERNOR_AC=ondemand

exec_all_session() {
  local username="$1" ; shift
  local cmd="$*"

  source "/home/$username/.dbus/session-bus/$(</var/lib/dbus/machine-id)-0"

  export DBUS_SESSION_BUS_ADDRESS
  eval export $(grep -z ^DISPLAY /proc/$DBUS_SESSION_BUS_PID/environ)
  su $username -c "$cmd"
}

####
# Configuration
####

case "$1" in
  ac)      mode="AC" ;;
  battery) mode="BATTERY" ;;
  *)       _usage ;;
esac

_usage() {
  echo "Usage: $0 [ac|battery]"
  exit 1
}

_getvalue() {
  eval "echo \$${1}_${mode}"
}

title="ACPI changed"
body="Energy change to $mode"
exec_all_session "matthieu" "notify-send \"$title\" \"$body\""


# SOUND
echo $(_getvalue SOUND_POWERSAVE) > /sys/module/snd_hda_intel/parameters/power_save


# CPU
echo $(_getvalue CPU_GOVERNOR) | tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor >/dev/null


# WIFI
/usr/sbin/iw dev "$WIFI_IFNAME" set power_save "$(_getvalue WIFI_POWERSAVE)"

laptop-udev.rules

# Execute energy.sh when the power supply change its state
SUBSYSTEM=="power_supply", ATTR{online}=="0", RUN+="/opt/ansible-workstation/laptop-udev/scripts/energy.sh battery"
SUBSYSTEM=="power_supply", ATTR{online}=="1", RUN+="/opt/ansible-workstation/laptop-udev/scripts/energy.sh ac"