Auto hibernate after suspend
The most laptops are configured to suspend after a period of inactivity or when the laptop lid is closed. The standard suspend-to-ram method keeps many functions of the computer still alive and keeps consuming battery. To avoid running into low battery status while sleeping it would be a good idea to send the computer to hibernate after a defined period.
To get this done we can use rctwake which is a part of the pm-utils package. All we have to do is to add a script in the '/etc/pm/sleep.d' directory. We name the file '0099autohibernate'. The numbers at the start tell the pm-utils that the script is executed first on suspend '00' and on wake '99'.
#!/bin/bash # Script name: /etc/pm/sleep.d/0099autohibernate # Toggle hibernation after a defined period of sleep curtime=$(date +%s) # Define the time until hibernation in seconds autohibernate=7200 echo "$curtime $1" >>/tmp/autohibernate.log if [ "$1" = "suspend" ] then # Suspending. Record current time, and set a wake up timer. echo "$curtime" >/var/run/pm-utils/locks/rtchibernate.lock rtcwake -m no -s $autohibernate fi if [ "$1" = "resume" ] then # Coming out of sleep sustime=$(cat /var/run/pm-utils/locks/rtchibernate.lock) rm /var/run/pm-utils/locks/rtchibernate.lock # Did we wake up due to the rtc timer above? if [ $(($curtime - $sustime)) -ge $autohibernate ] then # Then hibernate rm /var/run/pm-utils/locks/pm-suspend.lock /usr/sbin/pm-hibernate else # Otherwise cancel the rtc timer and wake up normally. rtcwake -m no -s 1 fi fi
Dont forget to set the executable flag for the script.
chmod +x /etc/pm/sleep.d/0099autohibernate
With this done your computer should go to sleep after 2 hours (as we defined 7200 seconds in the script).