It isn't clear yet how this should work. There are only a few wake lines available on the board. I'm not sure if the PWR or RST buttons should cause a wake. Something to try is WOL, USB wake, and the E6XX resume well GPIOs SUS[...].
MinnowBoard v1 has reached new feature EOL, FW development is done as are new hardware features. If you feel EXCEEDINGLY strongly about an issue please re-open it for discussion but be aware that we are recommending individuals migrate to the MAX platform.