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Send Mac to sleep with external screen and closing the lid (Yosemite)

I had the problem of my Mac not going into sleep when external screen is connected and closing the lid. Luckly I came across this advice which indeed, did the trick:

  1. Disable external Monitor
  2. Type sudo nvram boot-args="iog=0x0"
  3. and restart

VoilĂ !

Update : With Yosemite you need to type:

sudo nvram boot-args="niog=1"