On/Off Shim and powered USB Hub

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Man you rock! That fixed it. In fact, that even exposed / fixed another issue that hadn’t even crossed my mind - the fact that upon providing power, the Pi was turning on automatically (with the USB hub plugged in).

Added the 1k resistor between pins 1 (3v3) and 9 (Gnd) and now the power button works. Shuts down, stay off, etc. Gets power, stays off until I hit the button, etc Woot.

Thanks to you and @niko - much appreciated!

Just some info (for any wary travelers who run into this same issue in the future and happen to stumble across this post):

My USB hub was the Belkin F5U404 Hi-Speed USB 2.0 4-Port Mobile Hub. And according to this link is noted as having: Faulty/bad design; Leaks current back up the cable to the Raspberry Pi.

To reiterate the fix:

  • Cut the 5v+ wire on the USB cable (assuming you’re powering the hub separately - otherwise if you do want to power it from the Pi perhaps the diode trick which is noted here and here may work for you)
  • Add a 1k resistor that connects 3v3 to GND (pin 1 and 9)