I don't see anything like your output via dmesg. Of course, I am using a D1000 with only one external monitor, a flash drive, and a Logitech webcam attached to it.
What do you have attached to your D6000?
Your setup seems much more complex than mine.
I execute the following command.
Code:
dmesg | grep -i usb | tail
Here is all I see.
Code:
[ 33.652821] usb usb4: New USB device found, idVendor=1d6b, idProduct=0003
[ 33.652822] usb usb4: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 33.652823] usb usb4: Product: xHCI Host Controller
[ 33.652824] usb usb4: Manufacturer: Linux 4.13.0-16-generic xhci-hcd
[ 33.652825] usb usb4: SerialNumber: 0000:39:00.0
[ 33.652941] hub 4-0:1.0: USB hub found
[ 38.634187] usb usb4: USB disconnect, device number 1
[ 38.635008] xhci_hcd 0000:39:00.0: USB bus 4 deregistered
[ 38.635043] usb usb3: USB disconnect, device number 1
[ 38.636173] xhci_hcd 0000:39:00.0: USB bus 3 deregistered
I have a second USB hub attached to my machine in addition to the D1000.