Carsten Maass a écrit :
Aurelien Jarno wrote:
# lsusb -v
cannot read device status, Protocol error (71)
Strange that you also get this error with libusb.
Could you please run "strace lsusb -v" and send me the result?
# strace lsusb -v
[snip]
write(1, "Bus 001 Device 004: ID 04a9:2206"..., 66Bus 001 Device 004: ID
04a9:2206 Canon, Inc. CanoScan N650U/N656U
) = 66
open("/dev/bus/usb/001/004", O_RDWR) = 3
ioctl(3, USBDEVFS_CONTROL, 0xbfb5ba6c) = -1 EPROTO (Protocol error)
ioctl(3, USBDEVFS_CONTROL, 0xbfb5ba6c) = -1 EPROTO (Protocol error)
It looks like your scanner has some problems to communicate with your
computer, even for simpler functions than scanning.
Have your tried it on another machine, have you check the cables?
You can also unplug and replug your device and see if there is something
strange in the kernel logs.
Also it seems you have built your own kernel, so make sure the USB
configuration is correct.
Bye,
Aurelien
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