You may wish to try suspend to ram, instead of hibernation; please save
any open work before testing, some systems don't handle suspend to ram
well.
sudo systemctl suspend
Hopefully this just works and suffices for your needs. It's not the same
as hibernation, but might reduce power use enough to use it.
Thanks
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1992154
Title:
hibernation is restricted with secure boot
Status in linux package in Ubuntu:
Confirmed
Bug description:
My PC will not hibernate with 22.04 and secure boot enabled.
Only workaround seems to be to disable secure boot, og do not hibernate.
Unfortunately my PC is locked on secure boot from the IT department.
As disabling secure boot is the most useful workaround, I mark this as
a security issue.
I get these messages from the kernel
sudo dmesg | grep lockdown
[sudo] password for kfa:
[ 0.000000] Kernel is locked down from EFI Secure Boot mode; see man
kernel_lockdown.7
[ 0.838074] Lockdown: swapper/0: hibernation is restricted; see man
kernel_lockdown.7
[ 1.902562] Lockdown: systemd: /dev/mem,kmem,port is restricted; see man
kernel_lockdown.7
[ 4.290619] Lockdown: systemd-logind: hibernation is restricted; see man
kernel_lockdown.7
I found a number of reports regarding this stating that it is not
possible to sign the memory when swapping it to disk. Possibly it is
solved in a later 5.19 kernel version, but 22.04 is on 5.15. I found a
5.17 kernel, but that did not solve the problem.
It is not possible for me to try the latest 5.19 kernel, as it has to
be signed to test this.
An alternative could be a patch to the Ubuntu kernel, disabling this
until a real solution is found.
Here are some references to other sites mentioning the problem
https://askubuntu.com/questions/1106105/hibernate-with-uefi-and-secure-boot-enabled
https://unix.stackexchange.com/questions/591488/why-does-the-kernel-lockdown-prevent-hibernation/591493#591493
https://askubuntu.com/questions/1259538/lockdown-systemd-logind-hibernation-is-restricted-see-man-kernel-lockdown-7
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