I just purchased a new Beaglebone Black RevC and I'm starting to experiment 
a bit. I'm seeing some strange behavior when trying to perform a graceful 
shutdown of the board. When connected through the micro USB shutdown works 
as expected. When an external power supply is used, and I'm connected 
through Ethernet, I can't get the board to shutdown properly.

Following are my two experimental cases:

*Case 1 - Power through USB*

   1. Start with all cables unplugged
   2. Connect to laptop through micro USB
   3. Lamp for 5V power turns on.
   4. Beaglebone boots in about 30s
   5. Push power button on Beaglebone
   6. Beaglebone shuts down in about 6s
   7. All LED's are off.

*Case 2 - External power*

   1. Start with all cables unplugged
   2. Apply external 5V power.
   3. Lamp for 5V power turns on.
   4. Beaglebone boots in about 30s
   5. Push power button on Beaglebone
   6. Nothing happens!

In each case, I also tried connecting through an SSH session. In both 
cases, pressing the power button is issuing a shutdown command. I also 
tried explicitly issuing a shutdown command through the SSH session (i.e. 
shutdown -h now). When powered through USB it works; when powered 
externally the shutdown doesn't occur.

Any ideas or suggestions?

Troy

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