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I'm using Kubuntu 21.04 and trying to hibernate/suspend-to-disk my laptop. I'm not having much luck. The errors I'm getting seem to suggest a deeper issue than all the other Q&As I've seen about this - most other answers seem to suggest echo disk | sudo tee /sys/power/state is the solution, but I can't even get that far. I've tried several things and ultimately ended up at the system sleep states documentation for the kernel, which says to check /sys/power/state and /sys/power/disk to see if it's even supported.

$ sudo systemctl hibernate
Failed to hibernate system via logind: Sleep verb "hibernate" not supported
$ echo disk | sudo tee /sys/power/state
disk
tee: /sys/power/state: Operation not permitted
$ cat /sys/power/state
freeze mem
$ cat /sys/power/disk
[disabled]

So it looks to me like my kernel doesn't support hibernation...? The sleep states docs also say,

Hibernation is supported if the CONFIG_HIBERNATION kernel configuration option is set. However, this option can only be set if support for the given CPU architecture includes the low-level code for system resume.

  • Is there a reason Kubuntu doesn't have it enabled by default but ships with a "Hibernate" action?
  • How would I go about enabling this option on the kernel?
  • This is pedantic, but is it important that my /sys/power/disk exists and reports [disabled] even though the kernel docs say it's supposed to not exist if hibernation is unsupported? Are the docs wrong?

Copypasta from system information:

Operating System: Kubuntu 21.04
KDE Plasma Version: 5.22.5
KDE Frameworks Version: 5.86.0
Qt Version: 5.15.2
Kernel Version: 5.11.0-38-generic (64-bit)
Graphics Platform: X11
Processors: 8 × 11th Gen Intel® Core™ i5-1135G7 @ 2.40GHz
Memory: 15.4 GiB of RAM
Graphics Processor: Mesa Intel® Xe Graphics

eritbh
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1 Answers1

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I got same problem and fixed it by following Ubuntu 18.04 can't resume after hibernate and https://unix.stackexchange.com/questions/114889/f20-unable-to-hibernate-sys-power-disk-disabled.

I disable Secure Boot in the bios and now got:

cat /sys/power/state 
freeze mem disk

cat /sys/power/disk 
[platform] shutdown reboot suspend test_resume

And hibernation is working in my kubuntu 21.10 laptop now. I did some other things before disabling Secure Boot so likely some other steps are needed for full functioning. Disabling Secure Boot fix /sys/power/disk been disable for me.

Nikolay
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