On 14/09/2020 11:19, NY wrote:

> The fact that a lead with the red 5V wire cut still experiences the
> problem suggests that back-feeding of power from hub to Pi *may* be a
> red herring. I'm wondering whether it's rogue negotiations on the data
> lines as the devices start up. Goodness knows how that can be resolved.

There's a post on the forum thread I mentioned which states that the Pi
must have all its power buses below 200mV in order to fully reset. It
seems that power from the hub's USB data lines is leaking onto the Pi
and causing the problem.
--
Dave

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