iMac does not enter sleep mode

Hello

My iMac will all of a sudden not more "standby". He worked for a long time without problem.

MAC OS: OS X El Capitan version 10.11.5.

MAC: iMac mid-2010 27 "

FileVault is turned on.

What I tried:

  1. Fix disk problems (first aid function)
  2. Discount to zero NVPRAM
  3. Reset the SMC
  4. The repaired disk permissions
  5. Restarted several times
  6. All updates are installed
  7. Update firmware (interface EFI)

Hypernation is set to the standard. Value = 0 (not changed)

Yes, it worked well with active FileVault. If this isn't the problem.

The computer will not be simple go to sleep or self according to setting Energy or actively by selecting mode 'sleep'.

In the console of the system log, I constantly see these errors when the iMac try to go to sleep:

06/18/2016 19.15.21,941 WindowServer [311]: device_generate_desktop_screenshot: authw 0x7f8ecc869c00 (2000), shield 0x7f8ecc0ab000 (2001)

06/18/2016 19.15.21,941 WindowServer [311]: device_generate_lock_screen_screenshot: authw 0x7f8ecc869c00 (2000) [0, 0, 0, 0] shield 0x7f8ecc0ab000 (2001), dev [2560,1440]

06/18/2016 19.15.22,068 WindowServer [311]: no sleep for WillPowerOffWithImages image

Especially the last of them worry. And there is no/private/var/vm files if it must be that.

Is there a simple and understandable way to solve this problem. Don't just suggest to just turn everything off as he worked and I did not change any settings.

I have the console of the system there is also a lot of errors/warning on Itunes if it could be linked to the issue:

18/06/2016 19.15.39,437 iTunes [738]: entry: _AMMuxedDeviceDisconnected, mux-device: 76

18/06/2016 19.15.39,437 iTunes [738]: entry: _AMMuxedDeviceDisconnected, mux-device: 71

18/06/2016 19.15.39,449 iTunes [738]: entry: __thr_AMMuxedDeviceDisconnected, mux-device: 76

18/06/2016 19.15.39,450 iTunes [738]: tid:45cbb - Mux ID not found in the mapping Dictionary

18/06/2016 19.15.39,450 iTunes [738]: tid:45cbb - handle cannot disconnect with invalid ecid

18/06/2016 19.15.39,450 iTunes [738]: entry: __thr_AMMuxedDeviceDisconnected, mux-device: 71

18/06/2016 19.15.39,450 iTunes [738]: tid:45cbb - Mux ID not found in the mapping Dictionary

18/06/2016 19.15.39,450 iTunes [738]: tid:45cbb - handle cannot disconnect with invalid ecid

18/06/2016 19.15.39,454 com.apple.xpc.launchd [1]: (com.apple.dpd [5986]) Service came out with abnormal code: 75

18/06/2016 19.15.39,000 kernel [0]: PM response has taken 100 ms (81, coreduetd)

This found ID of MUX is here for a long time.

Please launch the built-in activity monitor application and select the Select power tab

Discover ▹ all processes

in the menu bar, if it is not already selected. Also select

View columns ▹ ▹ prevention of sleep (or assertion of power)

Click on the header of the column preventing sleep to sort the table of process. A process which, if any, show Yes in this column?

Tags: Mac OS & System Software

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