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Disabling WiFi Power Management Permanently for Raspberry PI 3 with Raspbian Jessie

One problem I found when playing with my Raspberry PI3 (running Raspbian Jessie), is that the WiFi would drop after a certain amount of inactivity.  This was problematic at VMUG Meetings, and due to lack of having a screen to connect, I was forced to power-cycle the unit to get it back online.  After doing some googling, I found the built-in WiFi for the Raspberry PI 3 had some Power Management features, which were enabled by default. You can check

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