Want to start this post off by thanking my buddy Dean for writing this great
guide to setting up hibernate with Arch Linux.
Unfortunately, when I went to consult this post the other day to get things
setup on my Galago Pro his site was down.
Funny enough, it was because of a botched pacman -Syu… classic Arch 😉
Anyway, I’m just making good on my promise to steal his post so that I could
reference it from my own site in the future 😛
Not a complete rip though, as his guide assumes that you use Grub. With Arch, I
use systemd-boot (formerly gummi-boot) and the steps are a smidge different
to get things configured properly.
Funny enough while doing a bit more research on this I came across a post
talking about using the Gnome Tweak Tool to simply select “hibernate” instead of
“suspend” on lid close.
This doesn’t seem to be the case any longer, or perhaps it’s still something you
can do with Ubuntu’s tricked out version of GNOME.
Also worth noting that the reason you may want to hibernate instead of suspend
on lid close of your laptop is that your battery won’t drain in the same way
that it does with suspend in Linux.
Hibernating instead of suspend also introduces the need of pressing the power
button to wake the machine back up. It takes a bit of extra time to wake up so
if you’re a speed demon and need your machine to immediately wake up, you may
want to avoid hibernation.
I’m going to assume that you already have an Arch Linux system up and running
and that you’re using systemd-boot.
I’m also going to assume that you don’t already have a swap partition or file
setup. In my experience since moving back to Linux, there’s really no need to
have a swap partition or file unless you are doing hibernation or have an
extremely old machine.
It’s also recommended to use swap files instead of partitions as you can
resize swap without needing to fuck with your disk’s partitions.
First, let’s make, configure and enable our swap file:
# This is now produces a swapfile "with holes"
# sudo fallocate -l 32G /swapfile # Change 32G to your RAM amount
# This works much better, adjust "count" accordingly
sudo dd if=/dev/zero of=/swapfile bs=1M count=32768 status=progress
sudo chmod 600 /swapfile
sudo mkswap /swapfile
sudo swapon /swapfile
With our swap file ready to swap, we will need to add it to your /etc/fstab:
sudo vim /etc/fstab
And add this line to the bottom of the file:
/swapfile none swap default 0 0
Next, since we’re using a swap file and not a partition, we will need to know
the swap file’s offset so that we can configure the resume offset:
sudo filefrag -v /swapfile | sed -n '4p' | awk '{print $4+0}'
That will spit out a number that you should jot down or copy to your clipboard
so that we can use it in our next step.
YMMV on this next step as it’s contingent on what you named your boot entry:
sudo vim /boot/leader/entries/arch.conf
You should already have an options line in there. At the end of the line you
will need to add resume=**your root disk** and resume_offset=**swap file. The line should look fairly close to this:
offset**
options root=UUID=SOMEUUID rw resume=/dev/sda1 resume_offset=12345
Now that our boot loader entry is properly configured we will need to add resume
to our initial ramdisk’s hooks:
sudo vim /etc/mkinitcpio.conf
Find the line that starts with HOOKS= and add in resume after udev:
HOOKS=( base udev **resume** autodetect modconf block filesystems keyboard fsck )
And then recreate your initial ramdisk for your kernel (linux or linux-lts
for most people):
sudo mkinitcpio -p linux
All that’s left to do is to tell systemd-logind to hibernate instead of
suspending when the laptop’s lid is close:
sudo vim /etc/systemd/logind.conf
Find the line that starts with #HandleLidSwitch=, remove the comment and make
sure it’s being set to hibernate:
HandleLidSwitch=hibernate
You may also want to tweak some other things like HandleLidSwitchExternalPower
if you want to ensure you always hibernate and HandleSuspendKey if you happen
to have a suspend key and want to make sure it forces a hibernation as well.
At this point, we’re ready to reboot and test things out:
sudo reboot
If everything worked out, your system will reboot properly and when you close
your laptop’s lid it should take a moment to write RAM to disk and then appear
to complete shut off.
When you open it, it won’t resume until you press the power button briefly and
then should look like it’s booting up and present you with your lock screen if
you happen to use one.
Thanks again to my buddy Dean for his awesome tutorial and if you happen to
leverage this post to cover some other boot manager, drop me a comment!
