There are no lockdown mode restrictions on my system.
Kernel is not signed, but i switched to UKIs a couple months ago (hibernation worked fine with these).
It is worth noting that the failure is hibernating, not resuming.
Normally hibernate takes ~1 minute with fans spinning at max speed, but it recently started not finishing and instead being stuck on a black screen for more than 30 minutes without the fans running until i run out of patience (i hibernate before i go to sleep or head out) and force power off the system (power button 10 second press on my system).
if only secureboot support hibernate
My secure boot with hibernate works perfectly fine, or rather it did work fine before hibernate started freezing my system, secure boot or not.
With Linux? Kernel signed with your own key to get out of lockdown mode restrictions?
There are no lockdown mode restrictions on my system. Kernel is not signed, but i switched to UKIs a couple months ago (hibernation worked fine with these).
It is worth noting that the failure is hibernating, not resuming. Normally hibernate takes ~1 minute with fans spinning at max speed, but it recently started not finishing and instead being stuck on a black screen for more than 30 minutes without the fans running until i run out of patience (i hibernate before i go to sleep or head out) and force power off the system (power button 10 second press on my system).
Did you maybe run out of swap space?
hibernate + amdgpu is unfortunately fucking cursed in my experience.