[habibman]

Hello,


So I was browsing with Safari and I had to get up to leave. I did what I usually do: close the lid of the MBP and put it in the laptop protector in my backpack. I assumed the computer would go to sleep - I can't think of why that isn't a safe assumption.

Well, about an hour and a half later, I pull out my schorching hot MBP and am dumbfounded. It was clear, just by looking at the light, that the thing never went to sleep. I opened the computer, the keys were all lit but the screen would not turn on (probably a good thing considering how hot it was). I did a manual shutdown and let it cool off. Meanwhile I am slightly upset...

Now (having coolen off) it is working again (thankfully). I tried to close it again and it sleeps fine. Everything seems to be OK.

Questions:

1. Why may this have happened?

2. Should I be worried about this? Might it happen again?

3. Can any harm have come to the MBP or parts of it as a result? (it was really, really hot)

4. Should I be raising a fuss seeing as how it has hardly been a week since I got it?


5. Anything I haven't thought of with regards to this issue?


Thanks so much!

[Big Mac]

This happens with all laptops occasionally. Ensure it's truly asleep before forgetting about it.

[Simon]

Plugging or unplugging a USB device after you close the lid can prevent sleep (actually what happens is that the MBP is in the process of going to sleep and then wakes up again due to the USB event). BT devices can wake your MBP too (uncheck the option in the BT prefs).

[ghporter]

The ONLY freeze I've ever had with my MBP was because I didn't make sure it was completely off before I closed its lid. It hung up really good in an "almost asleep" condition, and I had to restart it by holding the power button to make it turn off and then turning it back on. It takes very little time for the machine to complete the sleep process, so it's worthwhile to be careful about letting the process finish.

[habibman]

Thanks for all of your help. I appreciate it.

I still have this concern though:

Can any damage have occred to the MBP or any of the parts as a result of the heat? I mean, I cold hold it, but it was burning (I don't want to overestimate how hot was, but I think it was hot enough that I couldn't have held it for too long. I could be wrong though since I was too shocked at the time).

Thanks!

[peeb]

No. The heat sensors will force a shut-off before damage occurs.

[markponcelet]

This is not an isolated issue. I have this problem, as do lots of other peopel who are currently talking about it on the apple discussion boards. Sometimes the MBP fails to fall asleep at all; sometimes it wakes up a second or two after going to sleep; or sometimes it wakes up when the laptop is moved. It's horribly annoying, and nothing I've tried has managed to stop the problem. Some people at apple are stating that it's a malfunctioning PMU, and that replacing the PMU might be the solution to the problem. Unfortunately, I can't test this, as my MBP is no longer covered by any sort of warranty.

One thing about the MBP freezing, though: Even though your screen is not coming on when you open the laptop, I don't think it's frozen. What's more likely is that the backlight didn't turn on. In bright sunlight, you'll see that the machine is running normally. Try closing the lid and opening it again. If that doesn't work -- well, I think I have managed to get things to work properly by pressing the power button and then the R key to get the machine to restart gracefully.

[Railroader]

I have this problem often with my MacBook (non-Pro) as well.

[Simon]

For those of you with MBP sleep issues, have you tried putting it to sleep manually and then closing the lid? Press cmd-alt-eject (or hit the power button and then hit 's' for sleep), wait till it falls asleep (pulsing LED) and then close the lid.

[habibman]

I think I might start just putting it to sleep manually. Still, I would prefer to just shut the lid So much easier!

But I did just shut the lid this morning and it literally took more than a full minute to go to sleep (after my previous experience I watched it closely). Sometimes it goes to sleep right away, but it is times like this morning that are unnerving because you never know if it is definitely going to sleep.

Anyways, I guess I'll do manual for a while...

[Simon]

Could be Safe Sleep causing the delay when you have lots of RAM used.

If you want you can disable Safe Sleep with

Code:
sudo pmset -a hibernatemode 0

You can re-enable it with

Code:
sudo pmset -a hibernatemode 3

If you turn Safe Sleep off you can delete the sleep image to recover disk space with

Code:
sudo rm /var/vm/sleepimage

[Andrew Stephens]

Mine does this almost every single day. I've tried all sorts of advice and now I just live with it. Most days I finish work and actually shut the whole MBP down and restart it when I get home. Lost count of the number of times I've put it in my bag asleep only to find it a few hours later red hot, fans howling away and the battery almost gone.
Obvioulsy it's not ideal as a restart takes time, but what else can you do.

Since I work connected to an external monitor and all sorts of USB stuff I also never found an order of actions that didn't result in the Mac waking itself up at some point in the disconnecting process. At least shutting it down prevents that annoyance.

I have owned about 6 or seven powerbooks, starting with a Wallstreet.; The wallstreet slept perfectly but each successive laptop has been worse and worse. I have NEVER seen a PC laptop behave this badly.

[Simon]

Originally Posted by Andrew Stephens 

Since I work connected to an external monitor and all sorts of USB stuff I also never found an order of actions that didn't result in the Mac waking itself up at some point in the disconnecting process.

I work with a smilar setup The right order is very simple actually: First unplug all USB devices, then put your mac to sleep. Then disconnect power, monitor, etc.