Safe Sleep (hibernatemode) not working

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Level 2

256 points

Safe Sleep (hibernatemode) not working

Having a little trouble with 'Safe Sleep'. I can't pinpoint when the problem started, but I don't have any pmu-altering dashboard widgets.

I get the usual 'reserve battery power' warning when there's few minutes left before the juice runs out. Then, the power cuts. No safe sleep at all; it's as though the battery has been yanked out.

I checked a few threads, and I've performed the 'hibernatemode' check in Terminal:

pmset -g | grep hibernatemode

The result I get is '3', which I assume is 'enabled'

My HD has got over 40gb free space remaining, so there's definitely enough room for a 'sleep image'.

Has anyone come across this, and does anyone know of any possible fixes?

Cheers in advance!

MacBook Core Duo (White) @ 2GHZ, 2GB RAM, 120GB HD Mac OS X (10.4.9) 23" Cinema Display, 120GB USB drive, 160GB Network Drive, Bluetooth Mighty Mouse

Posted on May 14, 2007 12:06 AM

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Answer 1

Best reply

Haribol

Level 4

2,455 points

May 14, 2007 12:17 AM in response to Mr Lizard

May be try to reset it...
sudo pmset -a hibernatemode 3

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Answer 2

May 14, 2007 6:57 AM in response to Mr Lizard

I would try an SMC reset:

1. Unplug the MB
2. Remove the battery
3. Hold the power button down for 10 seconds
4. Put everything back and boot up

When I installed the battery update, and my battery started dying early my MB wouldn't enter safesleep properly either. The SMC reset fixed safesleep. Apple shipping me a new battery fixed the early dying. Hopefully the SMC reset will fix you up.

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Answer 3

Mr Lizard Author

Level 2

256 points

May 15, 2007 12:07 AM in response to Shawn Parr

Thanks for the replies!

The sudo terminal trick unfortunately didn't work, but I'll try the SMC today.

Just got to wait for the battery to die again...!

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Answer 4

777iPod

Level 2

330 points

May 15, 2007 1:38 AM in response to Mr Lizard

You just take out the battery in sleep with out the ac adapter plugged in.

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Answer 5

JoeyR

Level 6

8,305 points

May 15, 2007 5:58 AM in response to Mr Lizard

Also... have you calibrated your battery? This is fairly common if your battery has not been calibrated... especially when you're talking about an ultra low battery state where your MacBook may think it has a little more time before it has to go into deep sleep than the battery can power it.

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Answer 6

konqui

Level 1

0 points

May 15, 2007 6:30 AM in response to Mr Lizard

I have the same problem and it is since the battery update.

I do a pmu and calibrated the battery install and deinstall the update. Nothing change. So for me I hope apple will bring a new battery update asap.

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Answer 7

Mr Lizard Author

Level 2

256 points

May 16, 2007 8:50 AM in response to JoeyR

Must admit it has been awhile since I did a calibration. I'm going to give this a go and see if it helps.

It did notice that OSX reported the battery had around 8 mins left, about 2 mins before it died. So this would concur with your theory that the remaining power is an overestimation.

Thanks for the tip, I'll try it tonight.

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Answer 8

777iPod

Level 2

330 points

May 16, 2007 8:54 AM in response to Mr Lizard

I just calibrated mine and it goes to sleep at 7 min. I think that is defaut to make sure the battery doesn't fully discharge, if it does you may not get it back.

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Answer 9

Aug 1, 2007 11:36 AM in response to konqui

I finally got mine to work. PMU and Calibration didn't do it for me, but I went through a bunch of hoops before it worked again:

1) Reset SMC (PMU)
2) Calibrate Battery (per Apple Docs)
3) Fully charge battery while sleeping
4) Let sleep for 5 or so days until battery fully discharges
5) Fully charge battery

I tried the long sleep trick since I was leaving for vacation and didn't need the Book. When I came home, it was no longer sleeping, but it did drop into Safe Sleep. When I plugged it back in and opened it up, it reloaded memory and came out of Safe Sleep. It's working properly again.

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