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Random waking by RTC (Alarm)

W

William Payne

macrumors 6502a
Original poster
Jan 10, 2017
931
360
Wanganui, New Zealand.
Noticed my Mac Pro randomly waking itself during the night last night, first time it has ever done it. It says it was due to a RTC(Alarm). I am not hugely sure what that is. I did a google search but still a little unsure.

I am sure its a minor thing, I just randomly noticed it and thought it was a bit weird.

Just thought I would ask and see what input I can get.
 
Anyone know anything about this stuff? It did it again during the night. It literally only started doing it a couple of days ago and had never done it before that. Even the system logs show that.
 
System log shows no RTC alarms before the 10th of december, the only 2 things I did on that day was connect my iPhone to it with cable which was the first time I had connected my iPhone to my mac. Also updated cuda. That was the only two things.
 
It's usually the "Wake for network access" setting in Energy Saver. Disable that. With Yosemite, Apple replaced mDNSresponder with discoveryd which also caused that behavior, 10.10.4 brought back mDNSresponder.

Unfortunately you didn't tell which system you use. In fact, you didn't tell anything, makes helping you a guessing game. At least you're on a Mac Pro as this is the Mac Pro forum, on the other hand there are plenty of examples where people misread Mac Pro for MacBook Pro, so might be on of those.

As you mentioned system logs, would you mind sharing the exact phrasing?
 
Sko said:
It's usually the "Wake for network access" setting in Energy Saver. Disable that. With Yosemite, Apple replaced mDNSresponder with discoveryd which also caused that behavior, 10.10.4 brought back mDNSresponder.

Unfortunately you didn't tell which system you use. In fact, you didn't tell anything, makes helping you a guessing game. At least you're on a Mac Pro as this is the Mac Pro forum, on the other hand there are plenty of examples where people misread Mac Pro for MacBook Pro, so might be on of those.

As you mentioned system logs, would you mind sharing the exact phrasing?
Click to expand...

Okey dokey. Fair enough request, I am on this forum so often with the regulars I didn't think to list my system. Mac Pro 4,1 flashed to 5,1 running high Sierra latest version 10.13.2 as updated on 8th of December. RTC (alarm) according to system log first appeared the night of 10th of December.

Only thing different I did in the 10th that I didn't do any other day was a Cuda update and plugged my iPhone into it.

No settings had been changed that weren't on before the RTC (Alarm) started happening.
 
Almost forgot, it might be some of the sharing options. I remember having this issue with Printer Sharing turned on.
 
Much to my confusion, it did not really do it last night after I turned off "Wake for ethernet network access". The only reason that really confuses me is I have always had that turned on and it never did it before.

Oh well. It doesn't need to access the internet while asleep so no big deal.
 
William Payne said:
Only thing different I did in the 10th that I didn't do any other day was a Cuda update and plugged my iPhone into it.
Click to expand...

Did you do anything with iCloud? In the MacBook subforum, there's a long thread about kernel panics on the rMB12 while the computer should be sleeping. Folks there found that something to do with iCloud was waking the system regularly. (The actual kernel panics have something to with the GPU not powering up properly.)
 
curmudgeonette said:
Did you do anything with iCloud? In the MacBook subforum, there's a long thread about kernel panics on the rMB12 while the computer should be sleeping. Folks there found that something to do with iCloud was waking the system regularly. (The actual kernel panics have something to with the GPU not powering up properly.)
Click to expand...

I did do a couple of things with iCloud actually. How would I know if I have had any kernel panics?

Computer works fine with no issues when awake.

That would make sense though as once I turned off it waking up due to Ethernet access the rtc alarms stopped.
 
you can just shut it down over night, a simple fix :D

there's a few things that will make it wake up like the night time clean up scripts.
 
well your not happy with it waking up so, which one your most happy doing pick.

boot time is so fast on a SSD it's not a huge difference.

a clean install of osx is a easy fix for most problems
 
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