How to squeeze more battery life from your Linux laptop

How to squeeze more battery life from your Linux laptop

Linux has a lot of advantages, but long battery life on a laptop isn’t usually one of them.

Manufacturers optimize their device drivers to work best on Windows, and while a laptop may perform just as well with Linux as on Windows, it will often eat through the battery more quickly. New versions of the Linux kernel have improved power-saving this in the past and hopefully will in the future, but here’s how you can get longer battery life today.
For laptops with Nvidia and AMD graphics

If you have a gaming laptop with Nvidia Optimus or AMD’s equivalent switchable graphics, Linux flat-out doesn’t handle it properly out of the box. By default, your laptop will use that power-hungry Nvidia or AMD GPU all the time. This can result in dramatically shorter battery life than you’d get on Windows.

Even if you don’t have switchable graphics and just have Nvidia or AMD graphics, the open-source graphics drivers aren’t as far along with power-management support. You’ll likely get better battery life by installing the proprietary Nvidia or AMD graphics drivers, which can enable the GPU’s lower-power state more reliably.

To fix this, you’ll want to install the Nvidia or AMD drivers. If you don’t care about graphics switching at all, both the Nvidia X Server Settings and AMD Catalyst Control Center tools offer a way to disable the dedicated GPU and always use the integrated one. After you make this change, you could get hours of longer battery life.

This is the one big “gotcha” with many modern laptops. Linux handles everyone else decently out-of-the-box, but not switchable graphics.
The usual power-saving tweaks

The usual tips for boosting battery life on a Windows laptop apply to Linux laptops, too.

You can easily control the power-saving options from your Linux desktop’s main settings window. For example, these options are all available in System Settings on Ubuntu’s Unity desktop.

Reduce your laptop’s screen brightness to get longer battery life. If your laptop has built-in brightness-reducing hotkeys, they should work on Linux. Otherwise, your desktop’s settings window should have a brightness option.

Configure your display to automatically turn off when you’re not using your computer. Don’t use a screensaver—that just wastes battery power. If your Linux distribution uses a screensaver by default, disable it and just have it turn the display off.

Set your laptop to automatically go into suspend mode after a reasonable amount of time so it will conserve battery power if you step away while it’s on.

Disable Bluetooth if you aren’t using it to lower power usage and get longer battery life. If you’re really desperate—let’s say you’re using your laptop on an airplane and aren’t tapping into the in-flight Wi-Fi—disable Wi-Fi, too.
Advanced tools

Modern Linux systems generally have low-level power-saving features configured in a smart way for laptops, so the below tools aren’t as necessary as they once were.

PowerTOP is a utility created by Intel for diagnosing problems with power consumption. It can scan your Linux system, identify what’s using too much power, and provide recommendations. If you’re trying to squeeze as much juice as possible from your battery, this can help.

You should find PowerTOP in your Linux distribution’s package repositories, so install it like you would any other package. You’ll need to run it from a terminal window. For example, on Ubuntu, open a terminal window and run the “sudo powertop —calibrate” command for the most accurate readings and recommendations.

TLP isn’t something most Linux laptop users will want to use, but it will often provide a way to wring a bit more battery life out of a Linux laptop. This command-line utility is designed to help you configure much more aggressive power-saving options.

Install it and it will automatically start at boot, configuring your laptop to use a more aggressive set of power-saving options. In other words, just installing TLP and starting it or rebooting should be enough to improve your battery life somewhat. You can also tweak these options yourself. Some users report another half hour of battery life after installing TLP—your mileage will probably vary.

Ultimately, what you do with your laptop affects its battery life a lot, too. If you’re using a heavy desktop environment and you have a lot of browser tabs open, you might get better battery life if you used more lightweight software. Sure, that much advice is obvious, but you may be better off switching to a lightweight Linux distribution like Lubuntu that comes with a lighter weight desktop and lightweight software. It’s worth a shot if you just aren’t getting enough battery life out of your laptop.

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