Sleep vs hibernate how to#

Like the UUID, we'll need to add this to the GRUB file and initramfs resume file. Next, we'll need to find out the swap file offset. ( /swapfile is the path to the swap file, and may be different on your computer use the exact path as returned by the cat /proc/swaps command). To find out the UUID of the partition on which your swap file is located, you can use the following command:

We'll need to add this to the GRUB file and initramfs resume file. Find out the UUID of the partition on which the swap file resides.

Sleep vs hibernate how to#

How to enable hibernation on Ubuntu (when using a swap file)ġ. You might also be interested in: 3 Tools To Display Linux Laptop Battery Information From the Command Line Those are the differences between hibernating with a swap partition and a swap file. In case you use a swap partition, use the UUID of the swap partition instead of the UUID of the partition on which the swap file is located in the instructions below, and don't add a swap file offset ( resume_offset parameter) anywhere. Here's an example with output from my laptop:Īs you can see, under Type it says file, so my computer is using a swap file (and its path is /swapfile), and its size is 8388604 kilobytes (8,3 GB).īy default, Ubuntu uses a swap file for some time (at least starting with Ubuntu 18.04), so the instructions below will assume that's what you're using. To find out the size of your computer's swap, and if it uses a swap file or partition (you'll need to know this later on), you can use this command: But you should know that if you already have an encrypted root filesystem, all the files on it - including the swap file - will also be encrypted, and the instructions below work in that case. Since my laptop's swap is not encrypted, I'm not able to try this with an encrypted swap, so the instructions below are for unencrypted swap files only. This article explains how to transition from a swap partition to a swap file - you can also use those instructions to create a bigger swap file.Īlso, these instructions won't work if you've specifically encrypted your swap. It's worth noting that you'll want to have a swap file at least as large as the computer's RAM (hibernation may or may not succeed if your computer has a swap file smaller than the system RAM). It's also important to note that hibernation in Ubuntu is disabled because there are issues with it on some computers, so it might not work for everyone. There was a bit of a chatter about re-visiting hibernate on Ubuntu with the 20.10 release, but it remained disabled by default. On non Debian-based Linux distributions you may need to use different commands for updating GRUB 2 (step 4) and regenerating initramfs (step 6) as these are Debian-specific commands.

The instructions below may work on other Linux distributions, but I only tested this on Ubuntu (it should work in the exact same way on any Debian-based and Ubuntu-based Linux distributions, including Pop!_OS, etc.). So I decided to enable the hibernate option (suspend to disk) and use that instead of the default sleep option (suspend to RAM), because it uses less power, so the laptop battery is not drained while not in use, albeit taking a bit longer to wake up from hibernation than from sleep. I've tried some solutions / workarounds, like this one (except for me the problem wasn't that the laptop was losing half its energy overnight, but all of it in only a few hours), but to no avail. My laptop's battery drains quite fast while it's sleeping. This article explains how to enable hibernation using systemd on recent Ubuntu releases when using a swap file (which is default for Ubuntu at least since version 18.04).