suspend-on-low-battery

suspend-on-low-battery.sh

#!/bin/bash

# This is a fix for my samsung np900x4c laptop, who doesn't seem to shutdown nicely when low on battery
# Just put this in your cron (Runs every 1 minute).
# * * * * *  /home/YOURUSERNAME/bin/suspend-on-low-battery

# ==== START FIX ====
# Command notify-send would not show the message on your 
# screen when started by cron. 
# This fix will work in any crontab. sudo crontab-e or crontab -e

# Make notify-send know where to send msgs http://askubuntu.com/a/472769/154623
export DISPLAY=:0 

# Gets current loggedin GNOME's username http://askubuntu.com/a/324746/154623
GNOME_USER=`ps -e -o user:30,pid,ppid,c,stime,tty,time,cmd | grep gnome-session | grep -v grep | head -1 | cut -d ' ' -f1`

# http://askubuntu.com/a/298622/154623
notify_send="sudo -u $GNOME_USER /usr/bin/notify-send" 

# ===== END FIX ====

battery_device=`sudo upower -e | grep -i battery | head -n 1`
battery_percentage=`sudo upower -i $battery_device | grep percentage | head -n 1 | cut -d ':'  -f 2 | tr -d ' ' | tr -d '%'`
battery_state=`sudo upower -i $battery_device | grep state | head -n 1 | cut -d ':'  -f 2 | tr -d ' '`

[ 20 -le $battery_percentage -a $battery_percentage -lt 25 -a $battery_state == "discharging" ] && $notify_send "A bateria está abaixo de 25%, vou desligar quando chegar em 10%"

[ 17 -le $battery_percentage -a $battery_percentage -lt 20 -a $battery_state == "discharging" ] && $notify_send "A bateria está abaixo de 20%, vou desligar quando chegar em 15%"

[ 16 -le $battery_percentage -a $battery_percentage -lt 17 -a $battery_state == "discharging" ] && $notify_send "A bateria está em 16%, VOU DESLIGAR daqui a SEGUNDOS, quando chegar em 15%"

# Gnome friendly suspend http://askubuntu.com/a/131022/154623 
[ $battery_percentage -le 15 -a $battery_state == "discharging" ] && $notify_send "Bateria em 15%, SUSPENDENDO AGORA!" && sleep 5 && \
dbus-send --system --print-reply                 \
          --dest="org.freedesktop.UPower"        \
          /org/freedesktop/UPower                \
          org.freedesktop.UPower.Suspend

# Uncomment to to make sure notify-send is really working
# $notify_send "Rodou!!!" >> /home/oniltonmaciel/bin/suspend.log 2>&1