Closed lid Mac keeps getting woken up by EHC2

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Level 1

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Closed lid Mac keeps getting woken up by EHC2

Hello community !

My MacBook Pro (15-inch 2.4/2.2GHz) started this several months ago : I close the lid to put it to sleep, but it randomly wakes up - sometimes several times an hour. The Apple logo lights up, the drive makes the 'wake up' sound, and just like that, it goes back to sleep.

I found the Terminal command syslog |grep -i "Wake reason", which lists all the times the Mac wakes up, along with the reason. I know that LID0 is the cover and UHC3 is the keyboard, but the mysterious ones are from EHC2 (with or without FRWR). Just last night, between 1:15 and 3:30, it woke up 29 times!

From what I read, this should be a USB (or Firewire) drive, but I don't have any attached... The Mac is connected via WiFi to an Airport Extreme (WITHOUT a USB drive), and is setup to NOT "Wake for Ethernet network access" (I don't have an Ethernet connection anyway). I recently deactivated Bluetooth connection, with no effect.

Could the fact that the Mac is always connected to the power adapter be the source of the problem? I just thought about this - will try to unplug it when putting the Mac to sleep..

Any ideas what might be the cause of this annoyance?

Thanks 🙂

MacBook Pro, Mac OS X (10.6.8)

Posted on Apr 21, 2012 2:06 AM

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Answer 1

Best reply

X423424X

Level 6

14,265 points

Apr 21, 2012 2:36 AM in response to Goozak

Just use PleaseSleep to solve these problems. That's how I solved my wake-from-sleep problem. I think mine was from USB too, in my case a non-apple keyboard with usb ports. But I was never sure and I wasn't going to give up my keyboard. PleaseSleep attempts to force the system to obey the energy saver settings.

I am curious though about something. With the power adaper in, open Terminal (in Utilities) and type the following:

pmset -g

what does the line that says "sleep" say?

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Answer 2

Goozak Author

Level 1

13 points

Apr 21, 2012 8:20 PM in response to X423424X

Thanks for the tip about PleaseSleep - just installed it, we'll see how it goes...

As for the Power Management Settings, the "sleep" setting is 20 when plugged in, and 15 unplugged.

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Answer 3

X423424X

Level 6

14,265 points

Apr 21, 2012 8:54 PM in response to Goozak

Ok, so much for that theory. I was hoping it would have also said "(imposed by x)" where x is a number.

Never mind.

Hope PleaseSleep works for you.

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Answer 4

Goozak Author

Level 1

13 points

May 6, 2012 2:54 AM in response to X423424X

PleaseSleep did help. I still have a couple of times where EHC2 wakes the computer (in groups of 3, within 45 seconds), but it seem much less frequent than before.

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Answer 5

Apr 15, 2014 11:17 AM in response to Goozak

Hey, my computer was having the same issue as yours (MBP 15, early 2011) and in my case, EHC2 turned out to be a bluetooth device that kept pairing.

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