On Mon, 18 Mar 2013, Bruce Guenter wrote:
> On Mon, Mar 11, 2013 at 02:48:50PM -0400, Alan Stern wrote:
> > Okay; if it happens again, collect the information and we'll go on from
> > there.
>
> Well, it's happened again, but it's obviously not a boot issue.
> Something happens after boot that is causing some errors. Complete
> dmesg attached.
Either the EHCI controller, the USB connection, or the device itself is
unreliable. The log shows a large number of resets at various times.
Search for lines matching
usb 2-3: reset high-speed USB device number 2 using ehci-pci
and you'll see. Finally, at timestamp 20673 a series of reset attempts
ended in failure. That's when the device was re-detected on the OHCI
controller.
If you want to find out what caused those resets, capture a usbmon
trace for bus 2. It may provide a clue.
Alan Stern
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