"Power Nap"?

glitch44

macrumors 65816
Original poster
Feb 28, 2006
1,092
67


So Power Nap is only for new laptops? The "2nd gen" Macbook Air doesn't really clarify things, since technically they're on the fourth or fifth generation.
 

GoCubsGo

macrumors Nehalem
Feb 19, 2005
35,753
146
I don't get why this is a feature that isn't supported on older (2-3 years old) machines. It seems odd. My MacPro wakes by itself all of the time, it may as well do something productive!
 

Tom8

macrumors 6502a
Oct 28, 2010
848
71
On the Apple site for Mountain Lion it says

"Power Nap requires a Mac notebook with built-in flash storage. May require a firmware update."

So it'll probably come in a firmware update, like the Lion internet recovery partition thing
 

Jamie0003

macrumors 6502a
Apr 17, 2009
665
41
Norfolk, UK
On the Apple site for Mountain Lion it says

"Power Nap requires a Mac notebook with built-in flash storage. May require a firmware update."

So it'll probably come in a firmware update, like the Lion internet recovery partition thing
I'm assuming that means macs WITH flash storage will need updating. I think the reason for this is because when a HDD has to start up, it needs to start spinning which would make noise; with SSD it doesn't.
 

Cougarcat

macrumors 604
Sep 19, 2003
7,766
2,551
I'm assuming that means macs WITH flash storage will need updating. I think the reason for this is because when a HDD has to start up, it needs to start spinning which would make noise; with SSD it doesn't.
It means it is limited to flash only, but some of those flash macs will require an update. Hard drive based macs are NOT supported.

If you think about it, this makes sense. You do not want a hard drive constantly turning, it will kill it and zap your battery.

(That might be what you were trying to say.)
 

pdjudd

macrumors 601
Jun 19, 2007
4,041
65
Plymouth, MN
If you think about it, this makes sense. You do not want a hard drive constantly turning, it will kill it and zap your battery.
That I think is the point of the feature - it’s exploiting the power advantages and non-moving part nature of SSD’s. It’s not efficient nor desirable to have a process that runs the hard drive during sleep - it wastes lots of power and it wears down the drive.
 

jharvey71884

macrumors 6502
May 3, 2011
286
24
That I think is the point of the feature - it’s exploiting the power advantages and non-moving part nature of SSD’s. It’s not efficient nor desirable to have a process that runs the hard drive during sleep - it wastes lots of power and it wears down the drive.

So if you have an older Macbook Pro, this feature will just not work, or you won't be able to update the release at all? Little confused.
 

pdjudd

macrumors 601
Jun 19, 2007
4,041
65
Plymouth, MN
So if you have an older Macbook Pro, this feature will just not work, or you won't be able to update the release at all? Little confused.
The way I understand it (I may be wrong), unless your laptop (this is only for laptops) came standard with a SSD (and nothing else), you cannot use this feature period. Even in some cases, a firmware update may be needed.

Apple doesn’t want this on any computer that has a stock spinning disk drive - they don’t want to risk damaging user’s disks with unnecessary activity. Maybe they will expand it to other laptops that have a SSD, but I wouldn’t count on it.
 

jharvey71884

macrumors 6502
May 3, 2011
286
24
So do they not wanting you downloading Mountain Lion in general then, or will they let you download it, but the feature won't work.
 

pdjudd

macrumors 601
Jun 19, 2007
4,041
65
Plymouth, MN
So do they not wanting you downloading Mountain Lion in general then, or will they let you download it, but the feature won't work.
Powernap is just one feature of ML - it’s just one that only works on certain limited macs just like Air Drop. That doesn’t mean at all that Apple doesn’t want you to download and install ML for the rest of the 200+ features.

ML works on all full 64 bit macs.

ETA: Here are the requirements for Mountain Lion - it supports a wide selection of Macs
 

Jamie0003

macrumors 6502a
Apr 17, 2009
665
41
Norfolk, UK
It means it is limited to flash only, but some of those flash macs will require an update. Hard drive based macs are NOT supported.

If you think about it, this makes sense. You do not want a hard drive constantly turning, it will kill it and zap your battery.

(That might be what you were trying to say.)
Yes exactly, lol what he said
 

bushido

Suspended
Mar 26, 2008
8,070
2,754
Germany
i have an old mid 2009 mbp which i upgraded with an SSD a while ago and i think i have the "Power Nap" option ...

when i go to the "save energy" settings there's a new button to enable. it says "check for e-mails and notifications during sleep mode every once in a while" (roughly translated from german) and i can enable it
 

treichert

macrumors 6502
Nov 7, 2007
397
155
Aachen, Germany
i have an old mid 2009 mbp which i upgraded with an SSD a while ago and i think i have the "Power Nap" option ...

when i go to the "save energy" settings there's a new button to enable. it says "check for e-mails and notifications during sleep mode every once in a while" (roughly translated from german) and i can enable it
Me too on a 2010 13" MBP with an SSD.
 

FoundAHalo

macrumors member
Jul 3, 2009
75
7
Raleigh, NC
On the Apple site for Mountain Lion it says

"Power Nap requires a Mac notebook with built-in flash storage. May require a firmware update."

So it'll probably come in a firmware update, like the Lion internet recovery partition thing
My MBA 11" with 10.8 DP4 is just prompted with EFI 1.4 update for "Macs running 10.8). Presumably to bring Power Nap?

UPDATE: Confirmed – EFI update brings Power Nap support
 
Last edited:

haravikk

macrumors 65816
May 1, 2005
1,490
19
Would this Power Nap thing not eat up more battery when turn on?
I think the point is that it should only use a tiny bit of power as it presumably keeps the processor at the lowest clock-speed, maybe forces the use of only one core, and since it requires an SSD there should be no significant heat, no need for fans etc., so power draw should be tiny.

The decision is whether you want to trade off a small amount of power drain for ensuring that syncing features continue. That said though I really don't see the usefulness if you're on the go, as you're unlikely to have access to Time Machine, and the last thing you want is your machine to be trying every nearby WiFi hotspot in an attempt to get online for e-mail etc.

Result is that this is most useful for a machine that's plugged in to charge at home, as you can save power without interrupting Time Machine backups, and when you re-open the machine it'll be up to date on e-mails etc.
 

darkslide29

macrumors 65816
Oct 5, 2011
1,490
222
San Francisco, California
Me too on a 2010 13" MBP with an SSD.
Have you been able to test this out and confirm that it works on your MBP with an SSD?

My girlfriend has a 2011 MBP and her biggest annoyance is waking up her MBP and having to wait for iMessages and emails to catch up. She is considering selling her MBP for a MBA just for this feature. I hate selling something of so much value on eBay or Craigslist, so I am trying to avoid it.

I am hoping we can just replace the stock hard drive on the MBP with a 128 or 256mb SSD and simply enable this feature. However, if it requires it to be an original SSD from Apple, then she will probably make the switch.
 

treichert

macrumors 6502
Nov 7, 2007
397
155
Aachen, Germany
As far as I can tell, it does not really do anything although I can activate it.

EDIT: Just went into Preferences and the box now gets unchecked after leaving System Preferences by itself - so possibly its appearance is just a bug.
 
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