Linux on laptop battery

Linux Command To Check Laptop Battery Health

W hat command I need to run to check the health of my System 76 laptop battery in Ubuntu or Debian Linux?

You can either use /sys/ file system or command line acpi or upower. You must login as root user. Open the Terminal application and type any one of the following command.

Tutorial details
Difficulty level	Easy
Root privileges	No
Requirements	None
Est. reading time	1m

Linux GUI tool to check your laptop battery health

Click on battery icon in the sidebar or top bar right side battery icon. You will get an window as follows:

Fig.01: Linux Laptop power statistics application in action

Linux command to check your laptop battery health

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upower -i /org/freedesktop/UPower/devices/battery_BAT0

Fig.02: acpi command output

Here is output from upower command:

Fig.03: upower command output

How Do I Get CPU Temperature Data?

How Do I Read Hard Disk Temperature?

See also

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5 Ways to check laptop Battery status and Level from Linux Terminal

We can easily check the battery status through GUI such as current battery percentage, whether it’s charging or not and how long it will be usable without charging, but we can’t check the battery health and other related information.

Yes, we have few utilities available for this in Linux and it can be achieved through command line.

We are going to discuss more this topic today through this article and I will try to cover most possible information we can.

Checking your battery health monthly once is a good practice. It will help you to identify whether we are facing any issues related to battery life or charge.Also, we can see battery model name, power source, vendor and battery technology, etc,.

Power management is a feature that turns off the power or switches system’s components to a low-power state when inactive.

Following Utilities are available in Linux to Check Battery Status.

• upower : upower is a command line tool which provides an interface to enumerate power sources on the system.
• acpi : acpi Shows information from the /proc or the /sys filesystem, such as battery status or thermal information.
• batstat : batstat is a command line tool to print battery status for linux.
• tlp : TLP brings you the benefits of advanced power management for Linux without changing any configuration.
• class file : The sysfs filesystem is a pseudo-filesystem which provides an interface to kernel data structures.

How to check Laptop Battery status using upower Command?

upower is a command line tool that provides an interface to enumerate power sources on the system. It control the latency of different operations on your computer, which enables you to save significant amounts of power.

Just run the following command to get the battery and it’s related information on Linux.

To check the specific information about battery, use the following format.

It’s same as above, but it’s taken after power cable plugged in, that’s why the state showing charging.

How to check Laptop Battery status using TLP command?

TLP is a free opensource feature-rich command line tool which optimize laptop battery without making any configuration change.

TLP brings you the benefits of advanced power management for Linux without the need to understand every technical detail. TLP comes with a default configuration already optimized for battery life, so you may just install and forget it. Nevertheless TLP is highly customizable to fulfil your specific requirements.

TLP package is available in most of the Linux distribution official repository such as Arch, Debian, Fedora, Gentoo, openSUSE, etc. Use your distribution Package Manager to install the TLP utility.

Just run the following command to get the battery and it’s related information on Linux.

To see other information as well.

How to check Laptop Battery status using ACPI Command?

ACPI stands for Advanced Configuration and Power Interface modules are kernel modules for different ACPI parts. They enable special ACPI functions or add information to /proc or /sys. These information can be parsed by acpid for events or other monitoring applications.

To see battery capacity.

To see more details about battery and related information.

How to check Laptop Battery status using Batstat Command?

batstat is a command line tool to print battery status in linux terminal.

How to check Laptop Battery status using sysfs filesystem?

The sysfs filesystem is a pseudo-filesystem which provides an interface to kernel data structures. The files under sysfs provide information about devices, kernel modules, filesystems, and other kernel components.

The sysfs filesystem is commonly mounted at /sys. Typically, it is mounted automatically by the system, but it can also be mounted manually using a command such as mount -t sysfs sysfs /sys

Many of the files in the sysfs filesystem are read-only, but some files are writable, allowing kernel variables to be changed. To avoid redundancy, symbolic links are heavily used to connect entries across the filesystem tree.

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TLP – Quickly Increase and Optimize Linux Laptop Battery Life

TLP is a free open source, feature-rich and command line tool for advanced power management, which helps to optimize battery life in laptops powered by Linux. It runs on every laptop brand, and ships in with a default configuration already tunned to effectively and reliably maintain battery life, so you can simply install and use it.

It performs power saving by allowing you to configure how devices such as CPU, disk, USBs, PCIs, radio devices should utilize power when your laptop is running on battery.

TLP Features:

• It is highly configurable through various power saving parameters.
• It uses automated background tasks.
• Uses kernel laptop mode and dirty buffer timeouts.
• Supports processor frequency scaling including “turbo boost” and “turbo core”.
• Has a power aware process scheduler for multi-core/hyper-threading.
• Provides for runtime power management for PCI(e) bus devices.
• PCI Express active state power management (PCIe ASPM).
• Supports radeon graphics power management (KMS and DPM).
• Has a I/O scheduler (per disk).
• Offers USB autosuspend with blacklist.
• Supports Wifi power saving mode.
• Also offers Audio power saving mode.
• Offers hard disk advanced power management level and spin down timeout (per disk).
• Also supports SATA aggressive link power management (ALPM) and so much more.

How to Install TLP Battery Management Tool in Linux

TLP package can be easily installed on Ubuntu as well as corresponding Linux Mint using TLP-PPA repository as shown.

On Debian 10.0 “Buster” and 9.0 “Stretch” add the following line to your /etc/apt/sources.list file.

and then update the system package cache and install it.

On Fedora, Arch Linux and OpenSuse, execute the following command as per your distribution.

How to Use TLP to Optimize Battery Life in Linux

Once you have installed TLP, its configuration file is /etc/default/tlp and you will have the following commands to use:

• tlp – apply laptop power saving settings
• tlp-stat – displays all power saving settings
• tlp-pcilist – displays PCI(e) device data
• tlp-usblist – for viewing USB devices data

It should start automatically as a service, you can check if it is running under SystemD using systemctl command.

After the service starts running, you have to restart the system to actually start using it. But you can prevent this by manually applying the current laptop power saving settings with root privileges using the sudo command, like so.

Afterwards, confirm that it is running using the following command, which actually shows system information and TLP status.

Show System and TLP Information

Important: As we mentioned before, it uses automated background tasks but you will not see any TLP background process or daemon in ps command output.

To view current TLP configuration, run the following command with -c option.

Show TLP Configuration

To display all power settings run the following command.

Show Power Saving Settings

To display Linux battery information, run the following command with -b switch.

Show Linux Battery Information

To display Temperatures and Fan Speed of system, run the following command with -t switch.

Show CPU Temperature and Fan Speed

To display Processor Data, run the following command with -p switch.

Show Processor Data

To display any Warnings, run the following command with -w switch.

Note: If your are using ThinkPad, there are certain specific packages you need to install for your distribution, that you can check from the TLP homepage. You will also find more information and a number of other usage commands there.

TLP is a useful tool for all laptops powered by Linux operating systems. Give us your thought about it via the comment form below, and you can let us know of any other similar tools you have come across as well.

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How To Improve Laptop Battery Performance In Linux

I use Arch Linux in my Laptop. One big problem I noticed while using Arch Linux is the poor battery performance. As you know already, Arch Linux is rolling-release and DIY distro and doesn’t ship with any power saving utilities by default. I thought that there is something drains my battery and leads to poor battery backup. How absurd! Well, if you’re having the same issue, don’t panic. In this tutorial, I will show you how to setup two most used power management tools called Laptop Mode Tools and Powertop to improve Laptop battery performance in Linux. These utilities are not just designed for Arch Linux, but for all Linux distros. If you’re facing any serious troubles with battery, you need to make sure you have setup power management right in your Laptop.

How To Improve Laptop Battery Performance In Linux

1. Laptop Mode Tools

Laptop Mode Tools, or LMT in short, is a power saving tool for Unix-like operating systems. It extends the battery life of your Laptop in several ways. It enables the Laptop Mode feature of the Linux kernel, which lets your hard drive spin down. And also, Laptop Mode Tools allows us to tweak a number of other power-related settings for different hardware devices using a simple configuration file. It is a cross-platform power saving utility, thus It will work on almost all modern Unix-like operating systems, such as Arch Linux, Red Hat, Fedora, CentOS, Debian, Ubuntu etc.

Install Laptop Mode Tools

Make sure you have removed any previously installed power saving utilities like TLP or anything else. Laptop Mode Tools is available in the default repositories of some Linux distributions. So, you can install it using the default package manager.

For Arch Linux and its derivatives, It is available in AUR. So, you can install it using any AUR helpers like Yay.

On Debian, Ubuntu, run:

Just in case your distribution doesn’t have laptop-mode-tools in the repositories, you can download the source and compile and install it manually as described below.

To do so, git clone the laptop-mode-tools repository using command:

The above command will clone the laptop-mode-tools repository in a directory called «laptop-mode-tools» in the current working directory.

Go to the laptop-mode-tools directory:

Then, run the following command to install it.

Configure Laptop Mode Tools

There are two configuration files. The main configuration file located is /etc/laptop-mode/laptop-mode.conf, and /etc/laptop-mode/conf.d/* directory contains dozens of feature-specific modules.

First, we need to enable laptop mode in our Laptop.

To do so, create/edit ‘/etc/default/acpi-support’ file:

Add the following line:

Save and close the file.

Next, edit main configuration file /etc/laptop-mode/laptop-mode.conf:

Find the following line:

Change it’s value from 0 to 1.

And also make sure the value of ENABLE_LAPTOP_MODE_ON_BATTERY option is set to 1.

Save and close the file.

Enable and start LMT service:

That’s it. Now, run the following command to verify if laptop-mode-tools is enabled or not.

Sample output would be:

If you got the output as 2, LMT is enabled and working! If the output is 0(zero), LMT is not enabled. Reboot the system and check again. And make sure that you have removed all other power management tools from the system.

Also, you can individually enable or disable other hardware modules. These modules can found in /etc/laptop-mode/conf.d/ directory. To view the list of all modules, run:

Sample output would be:

Each module can be enabled, disabled, or set to auto by changing the CONTROL_* argument of the respective config file in conf.d/ directory. LMT will attempt enable any modules where CONTROL_* is set to auto if ENABLE_AUTO_MODULES is set in /etc/laptop-mode/laptop-mode.conf file.

To check the list of modules which are enabled, disabled or set as auto, use grep command as shown below.

If you find an important module is disabled, you can enable it by editing the respective module file.

2. Powertop

If you’re not satisfied with the performance of Laptop Mode Tools, you can give Powertop a try. Powertop is a Linux power management tool designed by INTEL open source community. This tool can be used to investigate the power consumption issues of various hardware devices in your system.

Install Powertop

It is available in the default repositories of some Linux distributions.

In Arch Linux and its derivatives like Antergos, Manjaro Linux, Powertop can be installed using pacman as shown below.

On Debian, Ubuntu, Linux Mint:

On RPM based distributions like Fedora, run the following command to install it.

After installing, enable and start powertop service using commands:

Usage

Once installed, run it as sudo user like below.

When launching powertop without arguments, It starts in interactive mode.

The default interface of Powertop should look like below.

The utility has various sections. You can switch between them using the Tab and Shift+Tab keys. You can find all shortcut keys at the bottom of the Powertop interface. To quit this utility, just hit the Esc key.

As you see in Powertop interface, it lists the power usage of various hardware components. In addition, it also displays how many times the hardware components wakes up each second. So, if you want to improve the battery usage, you can reduce the wake up time of each devices.

To do this, go to Tunables section:

Here, Bad indicates that particular hardware is not saving power. And, “Good” indicates a power saving setting is in effect. To change between the values, just press ENTER key on any tunable.

Just pass «—auto-tune» argument with powertop command if you want to set all tunable options to their good setting without interaction.

You can even generate a report in CSV or HTML format for data analysis.

To generate CSV report, run:

Sample output:

You can view the csv report using any text editor.

To generate HTML report, run the following command instead.

You can view the newly generated report in your web browser.

Powertop HTML report

For more details, refer the man pages.

A note of caution: Be mindful that just use only one power management tool. If you use multiple power saving tools at a time, you may not get the proper or no result at all.

Here are some additional tips to reduce Laptop overheating:

• Make sure the room where you use your Laptop has proper air ventilation.
• Do not use it in a room with no or less air circulation.
• Buy and use any quality USB powered cooling pad.
• Power off your Laptop if you don’t use it. I have had a bad habit of leaving my Laptop powered on all day. Don’t do that. If you don’t use, just shut it down.
• Get your Laptop cleaned from time to time, at least 3 months once.
• More importantly, keep your Laptop out of sun, fire or any other hot places.

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