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0e1f616
(Get the code!)
Ok I have found the trigger for the usb error on my system. I did not have to insert/remove any device as such, but simply put the laptop into suspend mode. At the moment it resumes from suspend, the error can be consistently reproduced on both signed and testing kernels.
There are a number of other internal devices on the USB hub, such as WebCam SC-10HDP12631N, and ELAN Touchscreen. See my attached kern.log for full usb and suspend output.
Aug 14 18:05:57 730U3E kernel: [ 95.978282] usb 1-1.5: reset full-speed USB device number 4 using ehci-pci
Aug 14 18:05:57 730U3E kernel: [ 95.978287] usb 2-1.5: reset full-speed USB device number 3 using ehci-pci
Aug 14 18:05:57 730U3E kernel: [ 95.978520] usb 3-3: reset high-speed USB device number 2 using xhci_hcd
Aug 14 18:05:57 730U3E kernel: [ 96.166202] usb 1-1.4: reset high-speed USB device number 3 using ehci-pci
Aug 14 18:06:01 730U3E kernel: [ 100.429382] usb usb4-port2: Cannot enable. Maybe the USB cable is bad?
Aug 14 18:06:05 730U3E kernel: [ 104.520742] usb usb4-port2: Cannot enable. Maybe the USB cable is bad?
Aug 14 18:06:10 730U3E kernel: [ 108.592236] usb usb4-port2: Cannot enable. Maybe the USB cable is bad?