On Friday 03 July 2009, Pierre Ossman wrote:
quoted text
> Is there any way I can force
> the bus to power down and up again to simulate removal and reinsertion?

As Alan noted -- not really.  Maybe hook it up to an external
hub; most of those seem to claim they support power switching.

I did once have a system with an OHCI root hub which supported
power switching.  Which was handy because one UPS needed to
start its enumeration from link-power-off, not unlike what you
are observing.

That system made a good regression test for the feature in the
Linux-USB stack whereby it tried to force root hub enumeration
to start from power-off.  Since that system died a while back
(sigh), I no longer know if that still works on those fortunate
systems which *do* support such switching.

- Dave


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