[chbot] USB2 vs USB3 ports

[Geoff]

Similarly I have an ebook reader that will only charge when plugged into a
USB2.0 port, but not a USB3.0 port or just a normal power supply. I'm
afraid that to me, that is just a dumb restriction!

So yes, despite the fact that USB3 is meant to be backwards compatible,
some manufacturers have successfully avoided this technical achievement.

On Thu, Dec 8, 2016 at 10:24 AM, Dan Wallis <mrdanwallis at gmail.com> wrote:

> My wife bought an MP3 player from The Warehouse about a year ago, and
> our laptop doesn't recognise that there's anything plugged in when
> it's attached to the USB3 ports, but works just fine on the USB2 port.
> The cable is fine, since it's a regular micro-USB which we use happily
> for other devices on the USB3 ports without issue, and the same cable
> works with USB2 and this device. Maybe there's something in the device
> which refuses to talk anything newer than USB2. I'd link to it, but
> looks like they're not selling anymore.
>
> 2016-12-08 8:44 GMT+13:00 Volker Kuhlmann <list0570 at paradise.net.nz>:
> > On Thu 08 Dec 2016 08:16:11 NZDT +1300, Charles Manning wrote:
> >
> >> "If you are using a computer with USB3 ports, it’s suggested that you
> >> attach a USB2-compliant hub and connect your CHIP to the hub, instead of
> >> directly to the USB3 port."
> >
> > Pretty p.-poor, isn't it?
> >
> > If I had to guess the reason, I'd say it's because of reliability. Many
> > USB2 connectors (both plugs and sockets) are very pooly manufactured
> > with some insane tolerances, I can easily get unreliable connections by
> > wriggling a cable, that's a USB2 cable from CDL and a computer
> > case/maninboard bought in Christchurch so not even Aliexpress.
> > With USB3 sockets things get worse, because the contact area for the
> > USB2 plug in the 3 socket is much reduced.
> >
> > So presumably the devkit supplier doesn't want to cop the flac for the
> > PC industries' crappy hardware and is suggesting a way to make it
> > more(?) reliable. Whether a hub is indeed more reliable...
> >
> > Volker
> >
> > --
> > Volker Kuhlmann
> > http://volker.top.geek.nz/      Please do not CC list postings to me.
> >
> >
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