Hibernation Question

Something I've been curious about, but don't wanna do without some advice/"Don't do it" consultation.

What would happen if I put my laptop to hibernate, then remove the battery and unplug from AC (stopped applying power) for about 1 hour and then returned power and turned on? What should I expect, will it start up as nothing happened and remember the state of the lappy at the time of hibernation?
Or would it forget everything, and behave as if it had been improperly shut down?

Or something else?

 

Since it saves your current desktop state to the hard disk, then fully shuts the laptop off, I don't think anything will occur. It will just resume from hibernation like nothing happened.

 

It would resume as if nothing happened. Hibernate does not require any power as the contents of the RAM are written to disk.

 

Well, that's a good ability. I will see if thats the case... Which I hope it would be.

 

Yes, that is the point of hibernate. "Sleep" keeps everything in memory, and will lose if there is a power failure.

 

Since i dont use it, I disabled Hibernate and gained 4gb of HD space.

The hibernate.sys file is 4gb

 

Yeah, hibernate.sys will be the same size as system RAM. Of course, if you have 4GB of RAM (the most any normal person has on a laptop now) and a 60GB HDD (a small HDD by any standards these days), you are using up about 7% of your HDD. I guess if 7% or less of your HDD space is that important, it's worth disabling hybernate. I like having it on though, because I occasionally use it, and also because in the circumstance that my batt runs out while the laptop is on, I'd much rather have it go in to hibernate than lose anything I may have had open when the batt died than get a few percent of HDD back. Personal preference though.

 

I take it that this will do the same in XP?

 

I maybe wrong. But when though Vista/XP save the stuff in the hard drive, the computer still need a little power to keep it alive.

I remember with my XP computer (not using right now) in the setting I remember something talking about, " Will use little power to keep Hibernate working" something like that. Not sure if Vista says it.


Edit:I just found this on my Vista hope this helps:

Sleep is typically the best power-saving state to leave your mobile PC in when you're not using it. Shut down your mobile PC or put it into hibernation only when you must turn off the power (for example, when you want to add memory or you don’t plan to use the computer for several days).

Edit 2:Found this one to, I just did a Help Search on my computer and this is what i am finding;

What is hibernation?
Hibernation is a power-saving state that saves your open documents and programs to your hard disk and then turns off your computer. When you’re ready to use the computer again, it comes out of hibernation in seconds and restores all of your open programs and documents that were saved. Of all the power-saving states that Windows uses, hibernation uses the least amount of power. (From Swiss- least amout, but still using power. I think you can do a month with Hibernation)

Unlike sleep, hibernation on a mobile PC doesn't require any power to save your open documents and programs. Because sleep requires a small amount of power to maintain itself, Windows automatically puts the mobile PC into hibernation after an extended period of time to help conserve battery power.

Because hibernation on a mobile PC doesn't require any power to save your open documents and programs, Windows also puts the mobile PC into hibernation automatically when the battery charge reaches a critically low level.

On a mobile PC, you should use hibernation when you know that you won’t use your mobile PC for an extended period of time, and that you won't have an opportunity to charge the battery during that time.

 

Hibernation uses no power.
Even if you remove the battery , and plug the puter in afterwards,it will resume to your desired state.
I`m talking from experience here, I`ve done it when testing several batteries since I hate shutdown.

 

Wait a minute...I thought that with 4 GB of RAM, the Hibernate option is no longer available in Vista 64-bit (at least it was with me). As soon as I dropped back down to 3 GB RAM, Hibernate was available again.

 

you must have disabled it on 64bit, or it was some how disabled on default. Mine had the hibernation option straight away.

 

Yeah, I have 4GB RAM with Visa 64, and hibernate still works.

 

Nope, I definitely didn't do it myself. Matter of fact, I was trying to find out why it wasn't there, and through the Great Google saw that others were having a similar problem.

Not a big deal, since I can do it now with 3 GB, but I want to move back to 4 GB soon once I find out what the problems were that I was having (ridiculously long boot times and the OS itself running slower than with 3 GB...the research continues ).

 

Well, check the option availability , in the settings.
It should be there,just tick it.

 

Well, coming back from hibernate can take a long time. Are you sure you have enough space on disk to make a 4GB block? Maybe it has to be contiguous, or in a certain region (likely near beginning) of the disk.

 

Resume from Hibernation is definitely slower than a resume from sleep. It beats resuming from a SHUTDOWN though.

I honestly still don't see why people shutdown their operating systems. Maybe because XP did such a poor implementation of hibernation/sleep (due to the way it interacted with drivers). It sure is a lot more stable under Vista.

I managed to convince my boss here to start hibernating the computers to save us some energy. But before that can happen, he wants me to make sure we can wake them from LAN. Since most of the machines have different brands of NICs, I've got to test them individually. Sigh.

 

You should have no problems there. Both my Sager and a friends` desktop with AMD/ATI hardware resume from hibernation flawlessly.
But, video drivers make all the difference in the world :wink:

 

Yeah, definitely enough disk space. It's obviously just something I did somewhere along the way. I'm going to reinstall my other 2 GB module and work on getting it cleared up.

If nothing else, reloading Vista doesn't take long. At least it would be a clean slate at that point, and I could then track down which driver is slowing the OS down, as well.