Automatic wake up after 10 sec

[jscw]

My 2011 iMac 27 got trouble to sleep.
When I asked it to sleep, it did sleep, and then automatically wake up after 10 sec, and repeat the whole process.
Precisely, it's more like,

while (1)
{
sleep for 10 sec.
hear sounds from hard disk/fan and see the light of the wired keyboard turned on for a few sec.
}

Anyone has similar experiences?


The console message shows,
9/12/11 3:45:00.000 AM kernel: Wake reason: EHC1

 

[mr.tolgao]

I am not sure if it is the same problem. But I unchecked(disabled) "Wake for Network Access" option in Energy Savings settings. Now my MacBook Pro sleeps without waking up.

 

[jscw]

I am not sure if it is the same problem. But I unchecked(disabled) "Wake for Network Access" option in Energy Savings settings. Now my MacBook Pro sleeps without waking up.

Thanks for the reply, but I also turned off that option and the results are the same.

 

[product26]

My magic trackpad prevents my iMac from staying asleep. If you have any bluetooth devices try unchecking the "allow bluetooth devices to wake this computer" in the bluetooth preferences under the advanced button.

Also, if you upgraded to 10.7 from 10.6 it is possible that some previously installed software is causing an issue. I had MacFuse installed and it was preventing my machine from staying asleep.

 

[jscw]

My magic trackpad prevents my iMac from staying asleep. If you have any bluetooth devices try unchecking the "allow bluetooth devices to wake this computer" in the bluetooth preferences under the advanced button.

Also, if you upgraded to 10.7 from 10.6 it is possible that some previously installed software is causing an issue. I had MacFuse installed and it was preventing my machine from staying asleep.

Thanks for the reply. I've uncheck the "allow bluetooth devices to wake this computer", but the behavior is still the same.

9/12/11 5:46:44.000 AM kernel: Wake reason: EHC1
9/12/11 5:46:44.000 AM kernel: No interval found for . Using 8000000
9/12/11 5:46:44.000 AM kernel: No interval found for . Using 8000000
9/12/11 5:46:44.000 AM kernel: No interval found for . Using 8000000
9/12/11 5:46:44.000 AM kernel: No interval found for . Using 8000000
9/12/11 5:46:44.000 AM kernel: No interval found for . Using 8000000
9/12/11 5:46:44.000 AM kernel: Previous Sleep Cause: 5
9/12/11 5:46:44.000 AM kernel: The USB device HubDevice (Port 1 of Hub at 0xfd000000) may have caused a wake by issuing a remote wakeup (2)
9/12/11 5:46:44.000 AM kernel: The USB device Microsoft® 2.4GHz Transceiver v6.0 (Port 3 of Hub at 0xfd100000) may have caused a wake by issuing a remote wakeup (3)

 

[alanthebat]

I had exactly this issue. In my case it was down to an external USB device that was doing something every few seconds, which caused it to draw power from the USB port and wake up the Mac, which would then realise nothing was happening and go back to sleep. The fix was to power the USB device from an external power supply.

Hope this helps

Alan

 

[jscw]

I had exactly this issue. In my case it was down to an external USB device that was doing something every few seconds, which caused it to draw power from the USB port and wake up the Mac, which would then realise nothing was happening and go back to sleep. The fix was to power the USB device from an external power supply.

Hope this helps

Alan

Thank, Alan. Just figured out that my issue also related to an unused external usb device. Once I removed it, everything goes well. Great!
Really really hate to "power on" iMac everyday.