>>893
ここでもそんな話題があるね。
http://openbsd-archive.7691.n7.nabble.com/Transition-from-machdep-lidsuspend-to-machdep-lidaction-td331065.html

でここにちょっと書いてる、と。
https://www.openbsd.org/faq/upgrade61.html

sysctl machdep.lidsuspend renamed to machdep.lidaction. The machdep.lidsuspend sysctl variable has been renamed to machdep.lidaction. Setting it to 2 hibernates the machine when the lid is closed. Update sysctl.conf(5) to use the new name.