Hi, Thank you for this. > cat /sys/power/state I get: freeze mem > cat /sys/power/disk [disabled] > The first should include 'disk' and the second should say enabled or some such. So, clearly this is not set correctly. How do I make these changes, if I am allowed to? > Note that hibernation is probably not supported by theCentOS kernel if this is on a UEFI computer with Secure Boot enabled (it's not supported by Fedora kernels) as it's a possible vector to defeat the point of Secure Boot. I do have SecureBoot disabled (the computer would not boot after installation otherwise) and that is when I found the hidden "flag" to disable SecureBoot. > And yet another thing is that it's possible the initramfs isn't using resume=<hibernationimagedevice> which is currently a problem on Fedora. So you might need to add this to the grub.cfg on the kernel command line, something like resume=/dev/VG/swap or wherever it is. If it's a /dev/sdXY, i.e. on a regular partition, then use UUID. I know how to get it working on Fedora (modify /etc/default/grub and grub-instlall) or so I believe. Should I have to do the same thing on CentOS? Thanks again! -