Originally Posted by crazynapkinman
Figured it out. In CM11 go to settings>buttons>power button.
Check the "Screenshot" option.
Now when you long press rthe power button screenshot will be an option.
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A better way IMO is to set up snapshot by using the quick launch option in settings:interface:quick launch and assign snapshot.
Then swipe upward left or right to take a screen print depending on how you set it up either to the left or right on the semi circle.
As of Cm11-encore nightly 20140619 the quick launch settings is under Settings:fn buttons.