[sane-devel] Fwd: Canon DR-2580C commands hang with libusb: warning [libusb_code] ...

[m. allan noah]

That message implies a kernel or libusb bug. Do you see any errors
around that time when you run dmesg?

allan

On Sat, Jun 18, 2016 at 3:47 PM, Maarten Hoogendoorn <maarten at moretea.nl> wrote:
> Hi all,
>
> I've some problems with my ADF scanner. It's a Canon DR-2580C.
>
> Scanning works fine, as in: the pnm files get created and contain valid
> content, but scanimage does not terminate! It hangs after the following
> warning:
>
> libusb: warning [libusb_close] internal signalling write failed, closing
> anyway
>
> Some background information:
>
> I'm running nixos-unstable.
>
> $ scanimage -V
> scanimage (sane-backends) 1.0.25git; backend version 1.0.25
>
> $ scanimage -L
> device `v4l:/dev/video0' is a Noname Integrated Camera virtual device
> device `canon_dr:libusb:003:013' is a CANON DR-2580C scanner
>
> $ cat /sys/bus/usb/devices/3-2.2/power/control
> on
>
> ==> I don't believe that this is cause by usb autosuspend
>
> Furthermore, I had the scanner connected directly to my Thinkpad's USB port
>
> $ SANE_DEBUG_CANON_DR=30 scanimage -d 'canon_dr:libusb:003:013'
> --resolution=300 > 2580-1.pnm 2>2580-1.log
>
> This just hangs. The 2580-1.log can be found in [1], but I have included the
> last few lines of the log below:
>
> [canon_dr] sane_cancel: finish
> [canon_dr] sane_close: start
> [canon_dr] disconnect_fd: start
> [canon_dr] disconnecting usb device
> libusb: warning [libusb_close] internal signalling write failed, closing
> anyway
>
> Do you have any clue what might be the problem?
>
> Thanks,
> Maarten
>
> [1] http://maarten-hoogendoorn.nl/public-uploads/sane/2580-1.log
>
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