Re: bug 120981 - usb controller reset / disconnect -

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On Thu, 14 Jul 2016, Warren Postma wrote:

> I am also able to reproduce this USB disconnect glitch on a Dell Xeon
> workstation.  Is there any way I can get more verbose output to dmesg:
> 
> 
> On Sat, Jun 25, 2016 at 12:29:39PM +0000,
> bugzilla-daemon@xxxxxxxxxxxxxxxxxxx wrote:
> > https://bugzilla.kernel.org/show_bug.cgi?id=120981
> >
> >             Bug ID: 120981
> >            Summary: 4.6.x VIA VL805 USB 3.0 controller resets device
> >                     making it unusable until re-plugged
> >            Product: Drivers
> >            Version: 2.5
> >     Kernel Version: 4.6.x
> 
> Reproduced on 4.6.2, will try on 4.6.4. Any suggestions on how to
> gather additional logging info would be appreciated.

In addition to what Peter said, you can acquire a usbmon trace.  See 
the instructions in the kernel source file 
Documentation/usb/usbmon.txt.

Alan Stern

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