On Wed, 5 Jul 2006, Paulo R. Zanoni wrote:
> Hi.
>
> Please help me.
>
> My problem is this:
> I have a keyboard (that uses usb 2.0) and a USB HUB.
>
> With the computer powered off I connect the keyboard on the USB HUB and
> then I connect the usb hub to the computer. When, I turn on the computer,
> I get a lot of error messages, and the keyboard doesn't work.
>
> The messages I get are like this:
> "Device descriptor read/64, error -71"
> "Device not accepting adress 23, error -71"
> "Cannot enable port 1. Maybe the USB cable is bad?"
>
> If I keep typing, lots of messages appear on the console.
>
> If I unplug and then plug the usb hub again, the problem solves. And if I
> reboot the computer after this, the keyboard will still be OK.
> If I unplug and then plug the keyboard again, the problem solves. And if I
> reboot the computer after this, the keyboard will still be OK.
> But with my environment, it's impossible to keep plugging/unplugging the
> usb devices everytime...
>
> Everytime I unplug the computer from the wall plug (and turn it on...), I
> get the same problem again.
>
> Can anyone help me?
>
> Is there any way I can turn off and on a hub port to simulate a keyboard
> unplug and replug using software?
It's not clear that doing this will fix your problem, although it might.
There is a program publicly available for turning off power to hub ports:
http://www.gniibe.org/ac-power-by-usb/ac-power-control.html
The problem is that a lot of hubs don't actually support power switching
on their ports.
It would be best to attack your problem by first finding out what's going
wrong. To start with, you should rebuild the drivers with
CONFIG_USB_DEBUG turned on and post the dmesg log.
Alan Stern
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