On 06/20/2015 12:12 PM, Rich Shepard wrote:
> On Sat, 20 Jun 2015, King Beowulf wrote:
> 
>> $ su -c "dmesg |grep hub"
> 
>    Intersting:
> 
> [    0.403093] usbcore: registered new interface driver hub
> [    7.667926] hub 1-0:1.0: USB hub found
> [    7.667934] hub 1-0:1.0: 3 ports detected
> [    7.722944] hub 2-0:1.0: USB hub found
...
> [   10.640153] hub 3-0:1.0: USB hub found
> [   10.643788] hub 3-0:1.0: 3 ports detected
> [   10.696178] hub 4-0:1.0: USB hub found
> [   10.699730] hub 4-0:1.0: 3 ports detected
> [   13.059312] hub 1-0:1.0: unable to enumerate USB device on port 1
> [11116.231278] hub 1-0:1.0: unable to enumerate USB device on port 1
> [11122.699110] hub 1-0:1.0: unable to enumerate USB device on port 1
> [11257.578163] hub 1-0:1.0: unable to enumerate USB device on port 1
> [338573.222815] hub 1-0:1.0: unable to enumerate USB device on port 1
> [338612.868082] hub 1-0:1.0: unable to enumerate USB device on port 1
> [338785.931433] hub 1-0:1.0: unable to enumerate USB device on port 1
> [338971.208107] hub 1-0:1.0: unable to enumerate USB device on port 1
> [338973.480096] hub 1-0:1.0: unable to enumerate USB device on port 1
> [338979.280623] hub 1-0:1.0: unable to enumerate USB device on port 1
> [338981.552612] hub 1-0:1.0: unable to enumerate USB device on port 1
> [339443.014361] hub 2-0:1.0: port 2 disabled by hub (EMI?), re-enabling...
> 
>    So this is a bad port and not the hub itself?
> 
>

The motherboard has several hubs (and what ever other hubs you plugged
in externally), with several ports per hub.  Not all hub/posts have a
physical connection that you can use. Some are headers on the mobo, or
are used internally for some motherboard devices.

Based on above you have a bad port on hub 1 (with 3 ports, all "might"
be bad").  My bad port resides right next to the gigabit LAN port.

udevadm info -q all -p /sys/bus/usb/devices/1-0:1.0

or

lsusb -t
lsusb -v

have fun!






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