9 Replies Latest reply: Aug 1, 2007 11:36 AM by Scott Dayman
Mr Lizard Level 2 (255 points)
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
  • Haribol Level 4 (2,455 points)
    May be try to reset it...
    sudo pmset -a hibernatemode 3
  • Shawn Parr Level 2 (300 points)
    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.
  • Mr Lizard Level 2 (255 points)
    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...!
  • 777iPod Level 2 (330 points)
    You just take out the battery in sleep with out the ac adapter plugged in.
  • JoeyR Level 6 (8,280 points)
    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.
  • konqui Level 1 (0 points)
    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.
  • Mr Lizard Level 2 (255 points)
    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.
  • 777iPod Level 2 (330 points)
    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.
  • Scott Dayman Level 2 (255 points)
    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.