System keeps waking from sleep every 2 hours

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?

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...

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.

i created a bug and Apple Answerd me this:

Apple Developer Relations13-Jan-2015 11:50 PM

Thanks for your feedback. You will not be able to directly view the original report for confidentiality, in order to protect the other bug filer’s information. Based on notes in the original report, ID 17346484, we believe this issue has been addressed in the latest OS X Yosemite 10.10.2 update. If you, or someone in your organization, has access to pre-release Apple products, you should test with the latest 10.10.2 seed. If you still see the issue, please file a new report on the 10.10.2 release, with fresh diagnostics. OS X Yosemite 10.10.2 (Build 14C94b) https://developer.apple.com/devcenter/mac/index.action This is a pre-release update to OS X Yosemite 10.10. Please refer to the seed note for more details and complete installation instructions. We are closing this bug report. Please be sure to regularly check new Apple releases for any updates that might affect this issue.

so i hope it will work on 10.10.2.....

It sounds like, from the comments above, that the issue is not fixed.

2014 Mac Pro, Yosemite 10.10.1... RTC (Alarm) problem here too.

Sorry to hear that Apple thinks it's fixed in 10.10.2, yet people continue to have the issue.

Not fixed for me 10.10.2b2

2009 Mac Pro

Waking every 1hr 34m

Could you check your console and see if you are getting a large number of "discoveryd" errors in addition to at the RTC (Alarm) wakings?

From last night. Here is my wake event (happening every night @ 2:00AM and then every 2 mins. thereafter) (running 10.10.2 (14C81h) Public Beta):

22 seconds later I got about 10 more in a row like this (looks like it's looking for my IP but the WiFi card had not connected to the hub I guess):

discoveryd[49]: Basic DNSResolver UDNS Send(): UDP Sendto() failed to DNSNameServer 192.168.1.254 Port 53 errno 49, fd 60, ErrLogCount 1 ResolverIntf:7

I shut it down soon after and went back to bed. I will keep it on a bit longer tonight and check the log in the AM.

my discoveryd console entries:

1/15/15 6:38:13.324 PM discoveryd[53]: Basic Warn DD_Warn: Corrupt NSEC RDATA size

1/15/15 6:38:13.326 PM discoveryd[53]: Basic Bonjour Failed to delete registration recordId=47 error=4

1/15/15 6:38:17.371 PM discoveryd[53]: Basic DNSResolver UDNSServer::ProcessEvent unknown event type: 7!

And 8 or more of these:

1/15/15 6:38:07.002 PM discoveryd[53]: Basic DNSResolver UDNS Send(): UDP Sendto() failed to DNSNameServer 10.0.1.1 Port 51384 errno 50, fd 47, ErrLogCount 1 ResolverIntf:0

OK. I installed the latest seed of the public beta (14C94b) yesterday and I slept soundly through the night because my MacPro did NOT wake @ 2:00 AM as it has been doing for a week now. Hopefully this fix will stick unlike the last one that worked for only a few days before reoccurring... fingers crossed

I'm running the same beta 10.10.2 (14C94b) and no change.

Still waking every hour and a half.

This is annoying.

I have updated Yosemite and, for me, the problem has gone.

I'm running Yosemite 10.10.2 on a mid2011 iMac.

Regards.

I'm also running Yosemite 10.10.2 on a mid2011 iMac. and for me too the problem has been solved.

No more wake ups in the middle of the night.