James Brust

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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Q: System keeps waking from sleep every 2 hours

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  • by Massimo Lombardo,

    Massimo Lombardo Massimo Lombardo Aug 14, 2016 7:32 AM in response to Eric Root
    Level 2 (200 points)
    Mac OS X
    Aug 14, 2016 7:32 AM in response to Eric Root

    Hi Eric,

    I have also seen that my iMac (late 2011) with 10.10.5 wakes every 2 hours. Console output: Wake Reason : RTC (Alarm). So I note the answers for the common issues with this tags and because the Time setting can be an other cause of this I decided to check the Date&Time Preferences. There was checked also the options to set D&T automatically @ an apple time server. I think that unchecking this option (I will control the Time every 1-2 weeks) can give more security.

     

    Ciao

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