Fix Linux not suspending on low battery levels, and prolong your battery life

Linux distributions like Fedora and Ubuntu will suspend a battery-powered system when the battery level drops to a critically low charge. They do this using the UPower subsystem. However, UPower’s default configuration isn’t great for battery longevity and it doesn’t always reserve enough charge to enter hibernation. Here’s how to prolong your laptop’s battery life and make sure it can handle low battery situations.