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 mediahound,

    mediahound mediahound Oct 22, 2014 2:18 PM in response to seduc
    Level 1 (19 points)
    Mac App Store
    Oct 22, 2014 2:18 PM in response to seduc

    It's clearly not the router since the issue only started after upgrading to Yosemite, same router.

  • by seduc,

    seduc seduc Oct 22, 2014 2:26 PM in response to mediahound
    Level 3 (510 points)
    Oct 22, 2014 2:26 PM in response to mediahound

    You can't exclude that. Yosemite could interpret signals in another way (=incompatible communication).

  • by GaryKing,

    GaryKing GaryKing Oct 22, 2014 5:12 PM in response to seduc
    Level 1 (10 points)
    Oct 22, 2014 5:12 PM in response to seduc

    It seems like a Yosemite issue and not an external issue, because the Mac will wake every 2 hours (almost exactly, but not quite). For instance, when I put my Mac to sleep for 8 hours while I sleep myself, it wakes at roughly 12:05 am, 2:01 am, 3:58 am, etc.

  • by Maclarean,

    Maclarean Maclarean Oct 23, 2014 6:07 AM in response to GaryKing
    Level 1 (0 points)
    Oct 23, 2014 6:07 AM in response to GaryKing

    Any news from this issue?

     

    I have this same issue: My iMac is waking up every 2 hours, no matter if I have internet connection or not. Wake reason (console log) is the same: RTC (Alarm). From the system preferences the wake up from internet access is not on, power nap is not on. Clearly a bug.

  • by seduc,

    seduc seduc Oct 23, 2014 6:23 AM in response to GaryKing
    Level 3 (510 points)
    Oct 23, 2014 6:23 AM in response to GaryKing

    Could you explain what the disantvatage/problem is when your computer wakes up for a few seconds while you are sleeping? Why did you even scroll trough the logs to find that message?

    Even if it should not do that. Why do you put that much effort into this issue?

  • by Matthew Wilson5,

    Matthew Wilson5 Matthew Wilson5 Oct 23, 2014 6:28 AM in response to seduc
    Level 1 (35 points)
    Oct 23, 2014 6:28 AM in response to seduc

    IIt's probably. not as big an issue if your machine is near silent or in another room - apart from wear and tear.

     

    On my 09 Mac Pro however the noise of the optical drive, the GPU fans and various case fans spinning up is enough to wake me.

     

    I'm  therefore stuck with shutting down or waking up myself every couple of hours.

  • by seduc,

    seduc seduc Oct 23, 2014 6:53 AM in response to Matthew Wilson5
    Level 3 (510 points)
    Oct 23, 2014 6:53 AM in response to Matthew Wilson5

    Ok thats a valid reason. You could run a script before and after sleep to fix it (would require password).

     

    before sleep:

    sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.discoveryd.plist


    after sleep:

    sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.discoveryd.plist

  • by James Brust,

    James Brust James Brust Oct 23, 2014 5:29 PM in response to seduc
    Level 1 (68 points)
    Oct 23, 2014 5:29 PM in response to seduc

    Would you mind explaining what exactly those commands do? If the "before sleep" command prevents waking up while sleeping, what does the second one do?

     

    And clarifying "before sleep" and "after sleep"? Before Sleep I have to assume would be anytime the computer is awake. But After Sleep I'm not clear on - I mean, you can't enter a command after the computer is asleep, can you? So running it "after sleep" would have to be once the machine is again awake - which would be the same state the machine is in when you run the "before sleep" command. What am I missing here?

  • by Wai Lam,

    Wai Lam Wai Lam Oct 24, 2014 6:23 PM in response to James Brust
    Level 1 (0 points)
    Oct 24, 2014 6:23 PM in response to James Brust

    Same problem here. My iMac wake up every 2 hours. Wake by network is disabled.

     

    Since my iMac is in my room. It bothering a lot. I need to switch off the mac now.

  • by seduc,

    seduc seduc Oct 25, 2014 12:23 AM in response to James Brust
    Level 3 (510 points)
    Oct 25, 2014 12:23 AM in response to James Brust

    before sleep (before you put the computer to sleep):

    sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.discoveryd.plist


    after sleep (after you woke it up – next time you use it):

    sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.discoveryd.plist

     

    This turns a system component off/on.

     

    Better would be if you raise logging and maybe find the cause of this behavior.

     

    Immediately before sleep:

    This will discoveryd log every thing it does.

         sudo discoveryutil log level Everything

     

    after sleep:

    Go back to normal logging

         sudo discoveryutil loglevel 1

  • by timfromargyll,

    timfromargyll timfromargyll Oct 26, 2014 4:08 AM in response to James Brust
    Level 1 (0 points)
    Oct 26, 2014 4:08 AM in response to James Brust

    I have the same problem. I updated to Yosemite on my mid-2010 iMac two days ago. Ever since then it has been partially waking from sleep throughout the night- just the discs but not the display. It shuts itself down again after about 20 seconds but is in our bedroom and wakes us up...


    Last night it it woke at 23.40, 01.29, 02.18, 04.07, 05.56 and 07.45. The previous night was a similar story...


    Wake for network access is off and I don't think this machine supports Power Nap or App Nap.

     

    I have not encountered this problem with previous versions of OS X

     

    It is driving me nuts...!

  • by seduc,

    seduc seduc Oct 26, 2014 4:14 AM in response to timfromargyll
    Level 3 (510 points)
    Oct 26, 2014 4:14 AM in response to timfromargyll

    System Preferences > Energy Saver > Restore Defaults

     

    Your system should now be suspended to disk after 70min of sleep. If not it can be set up to do so via terminal.

  • by SkyLilly,

    SkyLilly SkyLilly Oct 29, 2014 12:14 AM in response to James Brust
    Level 1 (5 points)
    Oct 29, 2014 12:14 AM in response to James Brust

    I am having this same problem. "10/28/14 5:19:55.000 AM kernel[0]: Wake reason: RTC (Alarm)"  Started after updating to Yosemite. I hope there will be an update soon to fix it! I don't feel comfortable going into the terminal and typing anything.

  • by RobbieTheCat,

    RobbieTheCat RobbieTheCat Oct 29, 2014 4:13 AM in response to James Brust
    Level 1 (0 points)
    Oct 29, 2014 4:13 AM in response to James Brust

    Another "me too". I've tried everything that I'm willing to do (i.e. not fiddling with Terminal) to ascertain what's what.

     

    Definitely a Yosemite issue. I've submitted a bug report to Apple, since they don't read these forums.

     

    Mac Pro (desktop)  Mid 2012.

  • by Paardeslager,

    Paardeslager Paardeslager Oct 29, 2014 5:23 AM in response to timfromargyll
    Level 1 (4 points)
    iPad
    Oct 29, 2014 5:23 AM in response to timfromargyll

    Exactly the same Mac and the same problem.

    It wakes me up too - I'm a light sleeper.

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