James Brust
Level 1 (68 points)

Q: System keeps waking from sleep every 2 hours

Since Yosemite update, system keeps waking from sleep approx. every 2 hours. It goes back to sleep on its own but keeps waking up again. I have "wake for network access" in System Preferences turned off. Here are samples of the console messages:

 

10/19/14 1:02:43.000 AM kernel[0]: Wake reason: RTC (Alarm)

10/19/14 1:02:43.000 AM kernel[0]: RTC: Maintenance 2014/10/19 08:02:43, sleep 2014/10/19 06:14:45

10/19/14 3:00:41.000 AM kernel[0]: Wake reason: RTC (Alarm)

10/19/14 3:00:41.000 AM kernel[0]: RTC: Maintenance 2014/10/19 10:00:41, sleep 2014/10/19 08:12:51

 

I have no idea what "Wake reason: RTC (Alarm)" means. Any help would be appreciated.

iMac, OS X Yosemite (10.10), 2011 iMac Intel Core i5 12GB RAM

Posted on Oct 19, 2014 5:20 PM

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James Brust

Q: System keeps waking from sleep every 2 hours

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  • by James Cage,

    James Cage James Cage Dec 23, 2014 7:31 PM in response to James Cage
    Level 1 (0 points)
    Dec 23, 2014 7:31 PM in response to James Cage

    I just can't believe this is happening again... i want to go out to the shed for the big hammer and beat the **** out of this machine!!!! Every 2 minutes again...

    Dec 24 01:05:51 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 24 02:01:46 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 24 02:03:40 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 24 02:05:36 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 24 02:07:32 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 24 02:09:27 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 24 02:11:24 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 24 02:13:20 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 24 02:15:25 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 24 02:17:16 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 24 02:19:12 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 24 02:21:22 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

  • by James Cage,

    James Cage James Cage Dec 24, 2014 8:02 PM in response to James Cage
    Level 1 (0 points)
    Dec 24, 2014 8:02 PM in response to James Cage

    A temporary solution. I've accidentaly unplugged magsafe from my MBP and it stopped! Of course it is not possible for iMac users, but for me it can be... because it is doing it every night in every 2 MINUTES!

     

    Dec 25 02:28:17 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 02:30:12 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 02:32:07 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 02:34:13 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 02:36:07 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 02:38:02 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 02:39:57 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 02:41:52 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 02:43:47 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 02:45:42 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 02:47:37 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 02:49:33 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 02:51:28 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 02:53:23 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 02:55:18 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 02:57:13 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 02:59:08 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 03:01:03 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 03:02:58 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 03:04:53 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 03:06:47 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 03:08:43 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 03:10:39 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 03:12:33 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 03:14:28 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 03:16:24 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 03:18:19 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 03:20:14 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 03:22:10 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 03:24:06 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 03:26:02 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 03:27:58 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 03:29:54 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 03:31:49 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 03:33:45 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 03:35:41 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 03:37:37 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 03:39:33 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 03:41:28 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 03:43:24 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 03:45:20 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 03:47:16 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 03:49:12 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 03:51:08 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 03:53:04 Yosemite kernel[0] <Notice>: Wake reason: RTC (Alarm)

    Dec 25 06:56:23 Yosemite kernel[0] <Notice>: Wake reason: EC.LidOpen (User)

  • by patH72,

    patH72 patH72 Dec 24, 2014 9:00 PM in response to James Cage
    Level 1 (34 points)
    Dec 24, 2014 9:00 PM in response to James Cage

    You might try this also, If you have an external disk plugged in to provide Time Machine backup services, try ejecting it and unplugging it before you put your computer to sleep. See if that helps.

  • by davidfrompalm desert,

    davidfrompalm desert davidfrompalm desert Dec 27, 2014 3:06 PM in response to patH72
    Level 1 (5 points)
    Dec 27, 2014 3:06 PM in response to patH72

    The only thing this would 'solve' is *hearing* the external drives wake.  I still hear the *internal* drive wake.  Spun up and spun down, over and over again.

     

    Model Name:    iMac

      Model Identifier:    iMac12,2

      Processor Name:    Intel Core i5

      Processor Speed:    2.7 GHz

      Memory:    16 GB

      Boot ROM Version:    IM121.0047.B1F

     

    12/27/14 2:49:34.000 PM kernel[0]: Wake reason: RTC (Alarm)

    12/27/14 2:49:34.000 PM kernel[0]: RTC: Maintenance 2014/12/27 22:49:34, sleep 2014/12/27 21:01:3

    12/27/14 2:49:34.000 PM kernel[0]: Previous sleep cause: 5

     

    According to the rest of the Console logs, it carries on endlessly, every two hours, when the computer is 'sleeping'.  So a dozen times a day, it wakes and spins up the drive.  I unplugged everything, disabled every 'wake on' tick mark I could find.  Nothing prevents it.  It looks like it's doing that 'power nap' BS, but with absolutely no way to ever turn it off.  The 'power nap' settings are missing in the System Preferences.

     

    Unless I completely shut it down, it keeps waking and waking and waking, beating the crap out of my computer's hardware.  Is this a hint that Apple wants me to hurry and buy something 'new', by destroying the old?

     

    It was beating the crap out of the external monitor and everything else, too, since my UPS was set up to turn everything off, if the computer was shut off.  Among everything else, I disabled that, and it still keeps waking.  Which underlines another issue.  If you 'sleep' it on UPS battery, it will carry on waking and sleeping while on battery power.

     

    I previously had the NEC monitor issues, too, where it would fail to turn the external monitor on/off.  They finally fixed it, and replaced it with something far worse.

  • by patH72,

    patH72 patH72 Dec 27, 2014 6:27 PM in response to davidfrompalm desert
    Level 1 (34 points)
    Dec 27, 2014 6:27 PM in response to davidfrompalm desert

    Almost every one of the wakes on my MacBook Pro is eliminated by ejecting and unplugging the Time Machine disk, which is connected via Firewrie 800. I don't know if just turning Time Machine off will also work, but I will try that as well. It takes time to test these things since you have to wait a couple of hours after trying something to see if it works.

     

    I also moved everything to "Not in Notification Center" in the Notification Center panel in System Preferences It's not clear if this has any effect.

     

    It has been a while since this has been reported. I've seen this discussed since the beta days of OS X 10.10, so it's a little discouraging that Apple has not addressed this yet. From my standpoint, until there is at least a workaround, I would not recommend upgrading to Yosemite until this problem is fixed, as you cannot have machines waking themselves willy-nilly, especially in situations where they are unattended, as is often the case with a sleeping machine.

  • by fremley,

    fremley fremley Dec 27, 2014 8:19 PM in response to patH72
    Level 1 (5 points)
    Apple Watch
    Dec 27, 2014 8:19 PM in response to patH72

    I've found that sleep is much more reliable after installing the latest system updates, particularly 10.10.2! I've not had a nighttime waking for nearly a week. Have others found this to be true?

  • by amors2,

    amors2 amors2 Dec 28, 2014 2:26 AM in response to fremley
    Level 1 (4 points)
    Dec 28, 2014 2:26 AM in response to fremley

    Yes. On 10.10.2 beta I've not had a nighttime waking.

  • by James Cage,

    James Cage James Cage Dec 28, 2014 12:00 PM in response to amors2
    Level 1 (0 points)
    Dec 28, 2014 12:00 PM in response to amors2

    Thanks guys for the suggession, I have installed 10.10.2 beta also, tonight I'll test it

  • by WaldeH,

    WaldeH WaldeH Dec 30, 2014 3:23 AM in response to James Brust
    Level 1 (0 points)
    Dec 30, 2014 3:23 AM in response to James Brust

    Hi. On 10.10.2 beta, installed 28. Dec. no more RTC wake up events in log! Tested on MBP 13" late 2009 and iMac27 late 2013.

  • by Matteo Pigni,

    Matteo Pigni Matteo Pigni Dec 30, 2014 4:43 AM in response to James Brust
    Level 1 (0 points)
    Dec 30, 2014 4:43 AM in response to James Brust

    I also have installed the 10.10.2 pubblic beta on my iMac late 2007, and thank goodness the problem seems fixed!!!

  • by Randy TM,

    Randy TM Randy TM Jan 1, 2015 9:36 PM in response to James Brust
    Level 1 (0 points)
    Jan 1, 2015 9:36 PM in response to James Brust

    I too can confirm that public beta 10.10.20 stops the wake issue I had on my MacPro (early 2008).

  • by babenes,

    babenes babenes Jan 4, 2015 5:23 AM in response to Randy TM
    Level 1 (0 points)
    Jan 4, 2015 5:23 AM in response to Randy TM

    Glad to hear the 10.10.2b release fixes the problem. I've had same wake from sleep problem as others here on my 2012 mac pro tower since upgrading to yosemite. I'll wait for the OS official release.

  • by NATENYC,

    NATENYC NATENYC Jan 9, 2015 11:23 AM in response to Randy TM
    Level 1 (0 points)
    Jan 9, 2015 11:23 AM in response to Randy TM

    I also installed the beta 10.10.2 and the wake issue went away on my MacPro (early 2009). 

    However, just this morning it starting waking up every 2 mins (it was only waking up every 2 hours before)  Nothing like being woken up by a jet engine!

     

    Anyone else re-experiencing wake issues?

  • by Randy TM,

    Randy TM Randy TM Jan 9, 2015 5:56 PM in response to NATENYC
    Level 1 (0 points)
    Jan 9, 2015 5:56 PM in response to NATENYC

    yup. All was well with beta 10.10.20 for a few days but the past two nights my MacPro (early 2008) has been waking up promptly at 2:25AM and then ever 2 mins there after until I manually shut it down (must be a conspiracy to save energy by forcing us to turn off our computers... lol) . Not really in the mood to trouble shoot it at that time so as of now I have no other information to offer. Shot a note to Apple via the feedback app about it... then back to bed...

  • by patH72,

    patH72 patH72 Jan 9, 2015 7:41 PM in response to Randy TM
    Level 1 (34 points)
    Jan 9, 2015 7:41 PM in response to Randy TM

    Here's another interesting aspect of this.

     

    I never noticed this recurrent, senseless waking on my personal office MacBook Pro and Mac Pro computers until installing Yosemite. As with others, it is obvious because attached disks spin up, etc.

     

    However, I was curious and checked the iMac at my university office which is running 10.8.something. Sure enough, it is waking up every 2 hours as the home Macs are doing with the RTC (Alarm) message in the log. This hasn't been noticed because when it's asleep I'm not usually in the office.

     

    So I'm pretty confused at this point. It sounds like the OS update actually makes the problem worse, so I'll be hesitant to install that one.

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