On Tue, 13 Dec 2016, or dv wrote: > kernel version: > Linux version 4.8.0-30-generic (buildd@lcy01-08) (gcc version 6.2.0 > 20161005 (Ubuntu 6.2.0-5ubuntu12) ) #32-Ubuntu SMP Fri Dec 2 03:43:27 > UTC 2016 > > kernel log shows: > Dec 13 21:31:27 merits kernel: [ 5835.972008] ohci-pci 0000:00:04.0: > HcDoneHead not written back; disabled > Dec 13 21:31:27 merits kernel: [ 5835.972014] ohci-pci 0000:00:04.0: > HC died; cleaning up > Dec 13 21:31:27 merits kernel: [ 5835.972335] usb 2-2: USB disconnect, > device number 2 > Dec 13 21:31:27 merits kernel: [ 5835.973969] usb 2-4: USB disconnect, > device number 3 > Dec 13 21:31:27 merits kernel: [ 5836.012277] usb 2-9: USB disconnect, > device number 5 This is a known bug in the 4.8 kernel. You should upgrade to the latest 4.8-stable version (currently 4.8.14); it contains a fix for this bug. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
