Although it's not related to the current problem, some USB devices do have a problem with "green machine" sleep modes. If there's an input during the entry into "sleep," the machine often fails to recognize the USB device when it "wakes up." It happens most often if you move a USB mouse while the "go to sleep" process is in mid snore.

I think there's a patch for that one, but I haven't needed it so I probably don't have any notes about it.

John