Cannot shutdown, logout,... on Fedora 40

[boredsquirrel]

@ken-kuro

The error message I encounter is hibernation is restricted; see man kernel_lockdown.7, which might be related to my dual-boot setup with SecureBoot, LUKS, and even BitLocker on the Windows side.

No that is just related to secureboot.

See more here:

Setup hibernation on Fedora Atomic Desktops

Summarized from some posts on the thread these were pulled from. TL;DR Is Secure Boot important? Yes. Should it be made better? Yes. Do you benefit from it in its current form (likely until >2028)? Almost certainly no. Can Secure Boot and Hibernate work together? Not without disabling even more important security features, or the kernel adding a feature it requires but hasn’t yet even designed. Why Secure Boot has to be disabled, but that’s OK. Everyone (including me) rejects the idea ou…

TLDR: kernel lockdown does not allow LUKS encrypted Swap partition, if secureboot is used.