On Wed, 26 Apr 2006, Greg KH wrote:
> > These are not USB 1.0 hubs; they are more recent than that!
>
> Ah, ok, I thought you were referring to 1.0 hubs above.
The way I phrased it was a little ambiguous.
> > In fact, lots of hubs don't implement port power switching. Even when
> > they say that power is turned off to some port, all they really mean is
> > that they will ignore any events on that port -- but the power is still
> > on. Relatively few brands of hubs truly do switch the power.
> >
> > (This has caused difficulties for people who want to use USB bus power as
> > a low-cost GPIO signal. They had to try a bunch of different brands
> > before finding some that worked.)
>
> Heh, I hadn't heard of people doing that before, that's funny.
For anyone who's interested, look here:
http://www.gniibe.org/ac-power-by-usb/ac-power-control.html
This isn't quite what I described, but close enough.
> Anyway, I don't have a problem with this change.
My only concern was that it might mess up some really old hubs. But since
you say we don't need to worry about supporting them, I'll submit the
patch.
Alan Stern
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