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PC no longer go into sleep after upgrade to 10.11

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I've just updated from 10.10.5 to 10.11. Everything seem work fine except the sleep function. When I click on Sleep => Monitor turn off => after a long time (about 15-20 secs) all usb devices are turned off, but CPU and GPU fun still running. And after that I can wake my computer up, the only one thing I can do is press the hot reset button or hold power button to shutdown computer.

I've done some investigation but still have no clue why my computer can't go to sleep (It just worked fine in 10.10.5).

Here are some information:

- System log before I press reset button



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