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No, it does work
Authored by: robg on Oct 18, '06 03:03:59PM
This isn't true. I just did it myself to prove it. Steps taken, with a never-tweaked MacBook:
  1. Run some apps.
  2. Close the lid.
  3. Wait for sleep light to start blinking (it's solid while RAM is written to disk).
  4. Remove power cord.
  5. Turn machine over, remove battery.
  6. Wait a few minutes, hours, days, whatever.
  7. Put battery back in, plug power in.
  8. Open lid and touch power button.
When you do this, you'll see that the machine doesn't boot from a power-off condition. Instead you see your grayed-out-screen and an odd progress indicator as the machine reads RAM from disk. After slightly longer than usual wake-from-sleep, you're right back where you were before the sleep/hibernate trick.

-rob.

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No, it does work
Authored by: clknight on Oct 18, '06 05:35:12PM

I agree--the "safe sleep" is present by default, and noticeable on my MacBook. If you put it to sleep there is a 30-60 second delay between when the screen turns off and when the HD spins down--during this you will notice the sleep LED comes on solid white but doesn't blink. I presume this is when the RAM gets written to disk.

One problem I've had, though--I've caused a kernel panic on several occasions by triggering the sudden motion sensor while it's writing RAM to disk. It's a little tricky--I close the lid, think it's asleep, drop it onto a pillow on the floor, and 8 hours later it's blazing hot and with the KP screen o' death visible on the non-backlit LCD. Anyone else ever done that?

---
Chris



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No, it does work
Authored by: soboroff on Oct 19, '06 06:30:53AM

Hmm. Ordinarily I skip steps 5-7, and I never have a progress bar when I open the lid. This and the info in the MacBook manual were my sources for my comment.

Perhaps things work this way. When you close the lid, it writes the RAM image but goes into normal sleep. On a critical batter condition, it goes to deep sleep. On wake, if we were in normal sleep, we just start running again. But if we were in deep sleep, we restore the RAM image.



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