Cross-posted from the driver thread.
I finally got this fixed. The "fix" was to swap the hot legs around on the appliance side of the switch. Once I did that, I started getting consistent power reports. I had previously swapped the legs around on the input side with no change.
Now that it's fixed, I think I see a trail to what the problem is.
###Pretty much everything below here is an assumption###
With 240V, there's two hot legs. Dryers are cyclic where they will toggle the heating element on and off. It would appear that the plug is checking one of the legs for power. If power is there, then it checks the other leg. If there is no power on the first leg, then it doesn't check the other one at all.
The reason I assume this is that, now that I'm getting the power reports, I can see that when I was getting a report of 0W before, I should have been getting ~470W. The dryer bounces between that and ~5100W when the heating element kicks back on. I assume the dryer only pulls power on one leg when the heating element is off. If that leg isn't the one the switch is set to check first, then you get a report of 0W.
