Anybody have an answer?

[Psychbum]

I posted this in the wrong part of MR duh!

Hibernation for M1?!

Hey, Does anybody know what the hibernation feature is for M1 Macs? - Saw it in the release notes for 11.3 but after installing can't actually see anything on the system that alludes to this feature at all...

forums.macrumors.com

Any ideas?

 

[cmaier]

I posted this in the wrong part of MR duh!

Hibernation for M1?!

Hey, Does anybody know what the hibernation feature is for M1 Macs? - Saw it in the release notes for 11.3 but after installing can't actually see anything on the system that alludes to this feature at all...

forums.macrumors.com

Any ideas?

Presumably, instead of just sleep, now hibernation is supported

 

[Psychbum]

Presumably, instead of just sleep, now hibernation is supported

But where would that be found within the system? and how would it work?

 

[Krevnik]

Apple uses hibernation for a feature called "Safe Sleep". If it is the same feature as on the Intel machines, then it's automatic and isn't something the user is meant to control. It's more that Apple laptops prepare to hibernate when you put the machine to sleep, so that if the battery gets low, it can hibernate instead of simply losing power.

What is safe sleep on Mac?

Safe sleep saves the current state of your Mac to the internal drive, so you don’t lose data if your Mac shuts down completely during sleep.

support.apple.com

 

[cmaier]

But where would that be found within the system? and how would it work?

If you close the lid and wait a long time, when the battery gets low it “hibernates” by writing state to disk, and powering more completely off. Transparent to the user. Not something you manually invoke, and the only way to tell it happened is if when you open the lid it takes a little longer than normal to come back on.

 

[Psychbum]

Thank you for these answers, has helped explain what it is and how it works. 👍🏼

 

[jdb8167]

But where would that be found within the system? and how would it work?

I can now see that my M1 MacBook Air has a hibernatefile setting from pmset and hibernatemode but hibernatemode is set to 0 which is still don't hibernate according to the man page.

Edit: Interesting. If you use pmset -g custom you get more results and it appears that hibernatemode is set to 3. Not sure exactly what this means. I'll have to do some experimenting but the difference is probably because I'm currently on AC power.

Edit 2: It looks like I had to restore defaults before the hibernatemode gets set to mode 3. After restoring defaults from both the System Preferences->Battery and from sudo pmset restoredefaults I have what looks like normal hibernate settings for a "portable" as Apple calls it.

 

[47ronin]

Thank you for this post! My M1 MBA hibernatemode was inadvertently set to '25' for some reason and was waking up really slow with macOS 11.3 (and required a typed password instead of touch ID).