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Subject: RE: USB2 problem

RE: USB2 problem

From: Matt Evans <>
Date: Tue, 25 May 2004 12:15:40 +0100

Hi Steve,

I have a row of usb ports that connect direct to the motherboard via
connectors. I am assuming that they are working OK since all my other USB2
devices are working at USB2 speed.

When I plug the USB2 lead in to the JBR it reboots. Sometimes it goes
through a continual cycle of reboot, rockbox splash screen, disc power up
(with failing backlight) then reboot. Sometimes it connects after about 10
cycles. With all of this activity windows pops up a message saying USB
device not recognised. It then pops up the hi-speed connected to normal
speed message.

I did have some problems with this type of activity before the rockbox
formware but it did make a usb2 connection in the end.

<complete amateur guessing> I wonder if there is a hardware fault that for
some reason becomes more problematic under rockbox. Perhaps with the
continual reboots windows for some reason thinks it's a usb1 connection but
later identifies it at high speed. </complete amateur guessing>

Damn shame as I was thinking about selling my JBR until I recently
discovered rockbox.


PS - I have disconnected all usb connectors, rebooted then reinstalled XP
SP1 then reconnected all usb connectors but it makes no difference :o(

-----Original Message-----
From: [] On
Behalf Of Steve R
Sent: 25 May 2004 09:30
Subject: Re: USB2 problem

Matt Evans wrote:
> Then a message comes up in the
> sys tray to say I am connecting a Hi-speed USB device to a normal USB
> connection.

Sounds like the AJB is being correctly recognised as a USB2 device, but (for
some reason), your hub is somehow appearing to be a USB1 (the rest of your
note implies you have a USB 2 hub). You don't say whether or not you are
using an external hub or not - if so, both it and your internal root hub
need to be USB2 to get USB2 speeds. (If either of them is USB1, then the
message you get is to be expected - but not the reboot, except for perhaps
the first time you attach the device).

If this is the case, the first thing I would try is unplugging all USB
devices, including external hubs, and then removing all USB devices within
Device Manager to get XP to reinstall all USB drivers and then try
connecting the AJB again.



Received on 2004-05-25

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