On Thu, 8 Feb 2007, Thomas Folz-Donahue wrote:

> So I took apart the USB cable.  It was unshielded (is that a violation
> of the USB spec?)

I don't think so.

>  and D+ and D- were not twisted (considered
> acceptable in low-speed devices).  Checking the resistances with a
> multimeter, I discovered that D+ was disconnected somewhere in the
> cable- when I hooked it up with alligator clips, everything worked.
> 
> [17253992.852000] ohci_hcd 0000:00:13.1: wakeup
> [17253993.236000] usb 3-1: new low speed USB device using ohci_hcd and
> address 22
> [17253993.444000] usb 3-1: string descriptor 0 read error: -75
> [17253993.444000] usb 3-1: configuration #0 chosen from 1 choice
> [17253993.444000] usb 3-1: config 0 descriptor??
> [17253993.452000] input: HID 062a:0000 as /class/input/input8
> [17253993.452000] input: USB HID v1.10 Mouse [HID 062a:0000] on
> usb-0000:00:13.1-1
> 
> Well.  At least it functions as a mouse again.  Whatever those errors
> mean.

The "string descriptor 0 read error: -75" means that the mouse tried to 
send more data than it was asked for.

The "config 0 descriptor??" message means that the mouse is not 
USB-compliant.  According to the spec configuration values must be 
numbered 1 or higher, but the mouse has a configuration value equal to 0.  
It's a relatively harmless flaw.

On the whole, I'd say this is a pretty low-quality mouse...

>  062a:0000 is a Creative Lite mouse, but this one  is branded
> GE.  Just to let you know what particular device had this particular
> malfunction.
> 
> Thanks for your assistance.

You're welcome.

Alan Stern


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