Hello Aurelien,
Aurelien Jarno wrote:
> 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.
I did some further investigations on this issue.
Although this configuration ran smoothly for several months until one of
the last upgrades, it now seems to have a problem with the USB-Hub
(Cypress Semiconductor Corp. CY7C65640 USB-2.0 "TetraHub"):
If I plug in the scanner directly to the computer it starts working
again. It also works on a different machine with an USB 2.0 Host
Controller.
The printer, which is also connected to the Cypress USB-Hub, doesn't
have any problems at all.
There are no strange messages in the kernel logs when I unplug and
replug the scanner.
Greetings,
Carsten.
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