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At 2:14 every morning, my Mac wakes. Looking at the logs, I see it's a scheduled event, but nothing shows up in System Preferences > Power. When I go to terminal, and run pmset -g sched, I see

Scheduled power events:
[0]  wake at 03/31/13 02:14:00

Only one, for the next event. I can delete it through pmset, and it won't wake that night (morning). The next day, there's a new event. So for instance, after that one went, now I see

Scheduled power events:
 [0]  wake at 04/01/13 02:14:00

I've locked the Power Management preferences, I've even set the file to remove all write access through chmod, and the next day... a new entry appears.

Taking Lauri's suggestion, I ran opensnoop on the Autowake.plist, and at 2:15, this happened, inserting that power event:

2013 Apr  4 02:15:00     0     20 powerd         4 /Library/Preferences/SystemConfiguration/ 
2013 Apr  4 02:15:00     0     20 powerd         5 /Library/Preferences/SystemConfiguration/ 
2013 Apr  4 02:15:00    89  15241 mdworker       4 /Library/Preferences/SystemConfiguration/ 

I didn't see anything in /Library/LaunchDaemons/ or /Library/LaunchAgents/ that seemed relevant. Execsnoop returned

2013 Apr  4 02:15:00    89  15241  14058 mdworker
2013 Apr  5 02:15:00    89  24165  19851 mdworker

What the heck is going on, and how do I stop this from happening? Or what's the next step to troubleshoot this? Thanks.

Vitals: it's a Mac Mini, 10.8.3, but it's done this for ages (including when migrated from a previous Mac Mini via Time Machine).

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Have you checked everything in /Library/LaunchDaemons/ or /Library/LaunchAgents/? You could try running sudo opensnoop -v -f /Library/Preferences/SystemConfiguration/ and sudo execsnoop -v > exec in two shells. Or just run sudo crontab -e and add something like */10 * * * * pmset repeat cancel. – user495470 Apr 2 '13 at 21:03
Done, and watching the file offered some new information, thanks. – DMZ Apr 4 '13 at 17:36
powerd is what modifies the file when you use pmset. The execsnoop command redirects output to a file named exec, which might show what other processes start before powerd. – user495470 Apr 5 '13 at 2:00
Thanks. Done, and added the excerpt from the output. There's nothing around the 02:15 entries that seems consistent (a lot of coreservicesd, mdworker, but not at the same timestamps every night...) – DMZ Apr 9 '13 at 2:23

The article posted here may help you. It details some plist files to delete that will be recreated on the next power up.

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Thanks. I'll report back and edit this when results are in. Initially, there was no reference to a 02:14 wake event in either file, and after deleting and recreating, the 02:14 event still doesn't show in Power Scheduling/these files, but appears when I do pmset -g sched. – DMZ Mar 31 '13 at 18:16
This seems to not have helped: the scheduled power event is still being inserted somehow. – DMZ Apr 1 '13 at 18:14

Run syslog |grep -i "Wake reason" from the terminal.

Reference this article:

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Done -- all I see are normal wake-on-keyboard events, like $ syslog | grep -i "Wake reason" Mar 30 14:12:45 Dereks-Mac-mini kernel[0] <Debug>: Wake reason: ? Mar 31 10:59:36 Dereks-Mac-mini kernel[0] <Debug>: Wake reason: ? – DMZ Mar 31 '13 at 18:03
What USB devices do you have plugged in? For me, my unexplained wake up was caused by a usb mouse. Once I unplugged it, no more issues. – Emjay Apr 1 '13 at 0:43
Keyboard, mouse. I also would expect if it's USB that it'd show in the wake reason -- was that true for you? – DMZ Apr 1 '13 at 4:01
Yes, it did show in the console log. It ended up being my Razer Orochi mouse. – Emjay Apr 1 '13 at 9:54
Right, but did it show as Wake Reason = USB, or what I'm seeing, as Wake Reason: ?. I'm skeptical this is the cause since a USB device might wake it, but is unlikely to be creating a scheduled power event every night for 02:14. – DMZ Apr 1 '13 at 18:16

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