On Thu, Jul 14, 2016 at 09:13:28PM -0400, 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-dae...@bugzilla.kernel.org 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.

Try to enable dynamic debug (CONFIG_DYNAMIC_DEBUG), and run below before
testing:

echo "file drivers/usb/* +p" > /sys/kernel/debug/dynamic_debug/control

-- 

Best Regards,
Peter Chen
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