On 5 April 2012 11:59, Tony Whitmore <tony@???> wrote:
> Hi all,
>
> I'm experiencing some weirdness with my Logitech USB trackball. I've had
> it for a few years and it's worked fine. Recently, it's started not
> being detected when I power on the machine. This isn't an X problem:
> Nothing is shown in lsusb and nothing appears in dmesg.
>
> If I unplug and re-plug the trackball, it works straight away. Both
> Ubuntu 11.10 and Fedora 16 (Live CD) exhibit this behaviour. It is a
> recent behaviour, nothing else has changed in the system.
>
> The trackball is connected to the rear USB sockets of my PC. Other
> devices plugged in to the rear USB sockets are not affected: USB sound
> device, USB hard disks, USB graphics tablet.
>
> I suspected a hardware fault, but have bought a new trackball and it
> exhibits the same problem. There are two front USB sockets and they also
> seem to exhibit the same behaviour, but less consistently.
>
> Any ideas?
>
Do you have any USB hubs? I have had similar problems due to faulty USB hubs.
In my case, the faulty USB hub was somehow affecting other usb
devices, and not just those plugged into the hub.
My guess is that it was something causing interference.
So, try power off, unplugging all USB devices except you trackball,
and then power on.
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