When I first received my dreamcatcher kit and trying various operating systems I followed the instructions in the docs to power everything off.
"8. Note that unlike Skylark, the root filesystem here is modified and is writeable, so it is important you shut this down properly:
When I issued the sudo poweroff command absolutely everything turned off including my computer - immediately. I am wondering what hardware the sudo poweroff command controls? I think in my case when I issued the command some programmable logic controller component on the Dreamcatcher board latched power to ground and it caused a short circuit that cauesd a high current drain on the computer USB port even though I have a separate 2.5 DC supply on the miniUSB port. This command killed my WiFi USB port on the dreamcatcher board. The WiFi dongle still works.
I would be curious if anyone else has tried this command recently? Be careful if you do use the command.