Hi,
I have configured the hibernate functionality on my KDE Neon 24.04 system when the kernel was at the version 6.8. It worked very well.
Recently KDE Neon upgraded to the kernel 6.11, and sadly the hibernate process doesn’t work anymore. It seems that the first step, saving the session, runs correctly as before. However, when I turn on the PC, after the message “resuming from xxx”, I see only a black screen instead of the login screen.
Just to be sure, I have booted my PC with the old kernel 6.8 (still available for now), and tried the hibernation process, and it still works correctly. So, I presume that the issue rely on the new kernel 6.11.
Anyone else having the same issue?
Than you for any suggestion.
do you have secure boot turned on in the firmware of your PC?
i’ve noticed the hibernate feature will not be available to linux if secure boot is turned on.
what is the output of cat /sys/power/disk
One of the requirements to be able to use hibernate is to have secure boot turned off.
If you have secure boot active, you can’t even start the hibernate process. So, on my system secure boot is off.
The output of the command you suggested is:
➤ cat /sys/power/disk
[platform] shutdown reboot suspend test_resume
The problem seems to be linked to the kernel version 6.11. However, I don’t know if it’s a problem only fo KDE Neon, or if all distributions have the same issue. For example, since KDE Neon is based on Ubuntu 24.04, the same issue is present also on Ubuntu 24.04? It would be nice to know.
when i use systemclt hibernate on 24.10 it will hiberate and resume just fine (using X11 anyway, haven’t tried it on wayland).
so i don’t think the kernel version is the problem.
i am having resume (wakeup actually) problems with hibernation if it sits overnight … it’s fine if i just step away from the PC during the day, but then in the morning the PC will not even boot or take a flash of the bios.
no one seems to have any idea why.
Well, glad that it works for you 
… at least during the day.
However, you have described a different system than mine: Ubuntu/Kubuntu 24.10 with X11.
My system is KDE Neon: KDE Plasma at the latest version (KDE Plasma, KDE Frameworks, QT), and Wayland.
As I said before, this very same system with the kernel 6.8 works perfectly, but it doesn’t resume correctly with the kernel 6.11.
At this point, I suppose that I have to wait for the next kernel updates, hoping that one of them will get the hibernate process working again 
.
fwiw, i’m still having the same issue on kubuntu 24.04 after a reinstall using whatever kernel that’s on (i don’t know because it wont boot right now).
starting to wonder if fedora would work better, or there is some weird time sensitive hardware glitch.
I have just updated my system with the latest kernel version 6.11.0-21-generic, and now the hibernate process works 100% like with the 6.8 kernel.
So, in the end I had only to wait until the issue was resolved, and this confirm my hypothesis that it was a kernel problem 
.