Delayed hibernation comes to OpenBSD/amd64 laptops https://www.undeadly.org/cgi?action=article;sid=20260312185620 #openbsd #amd64 #laptops #hibernation #suspend #powermanagement #sysctl #freesoftware #libresoftware

#OpenBSD -current now supports delayed hibernation, after a number of seconds (a maximum 86400, or 24 hrs) the machine will wake from S0ix/S3 idle sleep/suspend and hibernate to disk.

By default, it is not enabled. It can be configured in /etc/sysctl.conf.

kettenis@ modified src/sys/*: Implement delayed hibernation. If the machdep.hibernatedelay sysctl is set to a value that isn't zero, this specifies a number of seconds after which the machine will wake up from suspend and hibernate itself.

ok florian@, mlarkin@

Likely useful for those who pack away their laptops while travelling, etc. ​

I'd also recommend taking a peek at the "machine idle" feature in the bootloader, for machines that accidentally wake from hibernate and sit at the softraid(4) passphrase prompt, to powerdown the machine to save battery. ​

https://man.openbsd.org/man8/amd64/boot.8#idle

If you want to see some random photos:

https://www.instagram.com/_mizukara