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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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Anyone have a good working hibernate set-up in Linux? (lemmy.ca)

submitted 1 year ago by [email protected] to c/[email protected]

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My set-up is roughly analogous to this: https://community.frame.work/t/guide-fedora-36-hibernation-with-enabled-secure-boot-and-full-disk-encryption-fde-decrypting-over-tpm2/25474

Summary is that I use full-disk encryption (FDE) and use the TPM to decrypt the swap, and use full lockdown mode with a kernel patched to allow hibernation.

Suspend-then-hibernate (in my opinion) is a must-have feature for a laptop that goes in a backpack -- if I close my laptop's lid and put it in my backpack, I expect it to both not overheat, and to have some amount of battery left regardless of when I decide to take it out again.

Anyway, does anyone have it working well, or any other tips?

One thing I've been toying with is using a systemd script to drop the filesystem caches before hibernating to have it resume faster.

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[–] [email protected] 4 points 1 year ago* (last edited 1 year ago)

I am not sure if we are discussing hibernation for encrypted systems only, and I do not know what special provisions are needed for that, but for anyone curious, here is what I do on my own machine (not encrypted) per my own notes for setting up Arch, with a swap file rather than a swap partition, and rEFInd as the boot manager (the same kernel params could probably be used in Grub too, though):

create a file at sudo nano /etc/tmpfiles.d/hibernation_image_size.conf (copy paste the template from https://wiki.archlinux.org/title/Power_management/Suspend_and_hibernate)
if you made your swap file large enough (~1.2x ram size or greater), set the argument value to your amount of ram, e.g. 32GB= 34359738368
after a reboot, you can verify this with cat /sys/power/image_size
findmnt -no UUID -T /swapfile to get swapfile UUID
filefrag -v /swapfile | awk '$1=="0:" {print substr($4, 1, length($4)-2)}' to get offset
Go into your kernel parameters and add resume=UUID=### resume_offset=###
e.g. in /boot/refind_linux.conf (with efi partition unmounted)
go into /etc/mkinitcpio.conf and add “resume” after the “filesystem” and before the “fsck” hooks
run mkinitcpio -p linux-zen (or equivalent linux type)---