I dug into kernel code a bit, and looked where does the
/var/log/kern.log messages come (at least in my case):
usb 3-2: new high speed USB device using ehci_hcd and address 11
usb 3-2: device descriptor read/64, error -71
usb 3-2: device descriptor read/64, error -71
As far I as I can read the code, that -71 is EPROTO and it gets set by
the following
code in usb_get_descriptor() in file drivers/usb/core/message.c :
result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
(type << 8) + index, 0, buf, size,
USB_CTRL_GET_TIMEOUT);
if (result == 0 || result == -EPIPE)
continue;
if (result > 1 && ((u8 *)buf)[1] != type) {
result = -EPROTO;
continue;
}
Not much help there. Do others have the same error code/message in
their kern.log?
--
USB devices are not recognized when having ehci_hcd modprobed
https://bugs.launchpad.net/bugs/88746
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