Resolved: iMac 2012 Wake From Sleep Issues

[Macman45]

So the new 27" runs great, but instead of shutdown issues, I have wake from sleep problems. The imac runs perfectly, then sleeps at the allotted time fine.

If left for half an hour or so, it will wake normally. If left longer, it takes a couple (sometimes three) taps on the KB to wake it, when it once again runs fine.

Things I've done

SMC / PRAM re-et

Checked Indexing


I have a feeling that because I used MA to transfer my data ( Something I didn't want to do, but was persuaded, by my Apple rep to try) something has come over that should not have.


I should aslo say that the fix is a re-install of ML, but I'd really like to find a better / faster fix if one exists.

[Quad5Ny]

Can you do a experiment? Try waiting 5 seconds between taps.

The keyboard (if its wireless) may be asleep as well and it needs to wakeup/re-pair itself.

Or more likely, if the 2012 iMac supports standby hibernation what your waiting for is the system to copy the previous contents of your RAM that was copied to your hard drive back to your RAM from your hard drive (RAMception?).

Try a wired keyboard (or mouse). Also Open Terminal, type "pmset -g" and post the output here on the forum.

[Macman45]

Originally Posted by Quad5Ny

Can you do a experiment? Try waiting 5 seconds between taps.

The keyboard (if its wireless) may be asleep as well and it needs to wakeup/re-pair itself.

Or more likely, if the 2012 iMac supports standby hibernation what your waiting for is the system to copy the previous contents of your RAM that was copied to your hard drive back to your RAM from your hard drive (RAMception?).

Try a wired keyboard (or mouse). Also Open Terminal, type "pmset -g" and post the output here on the forum.

KB is wired...I think a clean install will probably fix this...not a big deal unless it gets worse.

[southerndoc]

It just takes a while to awaken it. I have a Bluetooth keyboard and trackpad. I can hit the trackpad once and it will awaken, but it takes about 20 seconds.

[Quad5Ny]

As long as the contents of the RAM haven't been moved over to the hard drive the computer should wake up instantly. That's why I was curious what the "pmset -g" output was (it would have listed the sleep options).

[Macman45]

Originally Posted by Quad5Ny

As long as the contents of the RAM haven't been moved over to the hard drive the computer should wake up instantly. That's why I was curious what the "pmset -g" output was (it would have listed the sleep options).

I'll have a go later on today...It now seems to wake at random too...I only noticed this last night when I got up for a drink...I'm happy with it particularly the screen so don't want a swap out really...I will probably re-insatll at the weekend.

----------

Originally Posted by southerndoc

It just takes a while to awaken it. I have a Bluetooth keyboard and trackpad. I can hit the trackpad once and it will awaken, but it takes about 20 seconds.

Terminal gives the following output:

tandby 1
powerbutton 0
womp 1
halfdim 1
hibernatefile /var/vm/sleepimage
autorestart 0
networkoversleep 0
disksleep 10
sleep 45
autopoweroffdelay 14400
hibernatemode 0
autopoweroff 1
ttyskeepawake 1
displaysleep 30
standbydelay 4200

[Quad5Ny]

It seems like your not the only one who is noticing their 2012 Mac's hibernating. Do you have a SSD (or Fusion Drive)?

Try this: "sudo pmset autopoweroff 0" and "sudo pmset standby 0"

Test your computer for a day with those set. If it solves your problem then you know there is nothing wrong, it was just your iMac Hibernating.

If it does not help, then you can still re-install.

P.S. If you like the hibernation, you can switch it back on by re-entering the commands with 1's instead of 0's. You can even change the amount of time by adjusting "autopoweroffdelay" and "standbydelay".

[Macman45]

Originally Posted by Quad5Ny

It seems like your not the only one who is noticing their 2012 Mac's hibernating. Do you have a SSD (or Fusion Drive)?

Try this: "sudo pmset autopoweroff 0" and "sudo pmset standby 0"

Test your computer for a day with those set. If it solves your problem then you know there is nothing wrong, it was just your iMac Hibernating.

If it does not help, then you can still re-install.

I will give that a shot....But I fear a reinstall is on the cards

----------

Originally Posted by Macman45

I will give that a shot....But I fear a reinstall is on the cards

It's the 3TB Fusion drive

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All now set to 0. Will leave it today and see, I do prefer it to sleep at night...guess I can just put them back, but it does seem to be ML related. Anybody running SL on a new IMac?

[Macman45]

Update.

This may help some people out...As suggested above and using terminal, playing with the values seems to have sorted out my issues. The iMac is now sleeping and waking as it should. Thanks for the tips!

[Quad5Ny]

Edit: Glad everything is working.

---

The iMac should still sleep, it just won't Hibernate (see below).

• Sleep/Standby: Machine state is held in RAM, then the computer cuts power to unneeded subsystems and places the RAM into a minimum power state.
• Hibernation: Machine state is saved to a Hard Drive and then the computer is turned completely off.
• Apple's Hybrid Standby-Hibernation: Machine state is saved to a Hard Drive, then the computer cuts power to unneeded subsystems including RAM.

This last one is what lets MacBook Air's stay "On" with the Lid closed for 30 days. I'm guessing they are now implementing it on other product lines that have SSD's to save energy. The SSD part its important because of how quickly they can copy the saved state back to RAM, HDD's are much slower (also HDD's take precious seconds to spin back up).

I really doubt Snow Leopard will run on the new iMac's without modifying it.

[Confuzzzed]

Always in awe of people that can do clever things in Terminal! Thanks for the tips

[Macman45]

Originally Posted by Quad5Ny

Edit: Glad everything is working.

---

The iMac should still sleep, it just won't Hibernate (see below).

• Sleep/Standby: Machine state is held in RAM, then the computer cuts power to unneeded subsystems and places the RAM into a minimum power state.
• Hibernation: Machine state is saved to a Hard Drive and then the computer is turned completely off.
• Apple's Hybrid Standby-Hibernation: Machine state is saved to a Hard Drive, then the computer cuts power to unneeded subsystems including RAM.

This last one is what lets MacBook Air's stay "On" with the Lid closed for 30 days. I'm guessing they are now implementing it on other product lines that have SSD's to save energy. The SSD part its important because of how quickly they can copy the saved state back to RAM, HDD's are much slower (also HDD's take precious seconds to spin back up).

I really doubt Snow Leopard will run on the new iMac's without modifying it.

Nope, I'm going to use Terminal from now on...It's now fine...Wakes as It should after a little more playing around...It wasn't a big deal as thing is perfect in use...Very fast and my old one was top spec in 2011 so it isn't slow.....Now we've nailed it I think...No need for a tedious reinstall...Thanks again!!

[Macman45]

Going to mark this resolved now, but keep it bookmarked...I think it could help a lot of people with the same issues.....threads cropping up all the time on the same topic. I guess Apple will fix it in an update...for now it seems the only way to effectively manage power settings is by using terminal...I have reported the bug to Apple, but I doubt I'm the first...

[Quad5Ny]

Last thing; If for whatever reason you restore a backup of your current iMac to a MacBook Air/Pro, remember to set those two things back to "1".

[Macman45]

Originally Posted by Quad5Ny

Last thing; If for whatever reason you restore a backup of your current iMac to a MacBook Air/Pro, remember to set those two things back to "1".

Spent up until I sell the old one and buy a new rMBP!

[JoeBoy73]

I'm having the same problem as Macman was...Mac won't wake up properly. Going to sleep on its own...here's my pmset -g info:

Active Profiles:
AC Power 1*
Currently in use:
autorestart 0
powerbutton 1
halfdim 1
panicrestart 157680000
hibernatefile /var/vm/sleepimage
networkoversleep 0
disksleep 10
sleep 10
hibernatemode 0
ttyskeepawake 1
displaysleep 5
womp 1

[Macman45]

Originally Posted by JoeBoy73

I'm having the same problem as Macman was...Mac won't wake up properly. Going to sleep on its own...here's my pmset -g info:

Active Profiles:
AC Power 1*
Currently in use:
autorestart 0
powerbutton 1
halfdim 1
panicrestart 157680000
hibernatefile /var/vm/sleepimage
networkoversleep 0
disksleep 10
sleep 10
hibernatemode 0
ttyskeepawake 1
displaysleep 5
womp 1

I have now used the terminal fix above on 3 iMacs, all of which had the same issue....using them and setting the power management to prevent hibernation has cured the issue in all three cases.

[MacChris87]

Here is my pmset -g

Active Profiles:
AC Power -1*
Currently in use:
standby 0
powerbutton 1
womp 1
halfdim 1
hibernatefile /var/vm/sleepimage
autorestart 0
networkoversleep 0
disksleep 10
sleep 10
autopoweroffdelay 14400
hibernatemode 0
autopoweroff 0
ttyskeepawake 1
displaysleep 10
standbydelay 4200

I am running a 2012 iMac with an HDD hard drive. I made both changes suggested on this thread in Terminal and I am still experiencing the problems. What else can I change?

[Macman45]

Originally Posted by MacChris87

Here is my pmset -g

Active Profiles:
AC Power -1*
Currently in use:
standby 0
powerbutton 1
womp 1
halfdim 1
hibernatefile /var/vm/sleepimage
autorestart 0
networkoversleep 0
disksleep 10
sleep 10
autopoweroffdelay 14400
hibernatemode 0
autopoweroff 0
ttyskeepawake 1
displaysleep 10
standbydelay 4200

I am running a 2012 iMac with an HDD hard drive. I made both changes suggested on this thread in Terminal and I am still experiencing the problems. What else can I change?

Is that the log AFTER you made the changes? If it is, you need to try again. I have had circumstances where I've had to do it twice before the change were properly applied.

[asif10]

I am having the same issue with my 2012 macbook pro retina.

I have had some success if i update the time autopoweroffdelay and standbydelay to 36000 (10 hrs), which essentially for me means it will never go to hibernate for me.

So for me, it looks like when it hibernates it doesn't wake up until i do a hard restart a few times.

(Booked in with Apple to see if they can fix this, but looking at some of the post from others, i shouldn't hold my breath)