[sane-devel] Need help with Canon scanner

Rolf Bensch rolf at bensch-online.de
Wed Aug 19 20:47:55 UTC 2015

Hi Alan,

The libsane version from Debian doesn't support your scanner.

You need to install Sane Development Version from git as described in
README.linux (http://www.sane-project.org/docs.html).


Am 19.08.2015 um 22:13 schrieb Alan McConnell:
> First of all, thanks for your post, with the helpful hints.  I
> can narrow my questions; see below.
> On Thu, Aug 20, 2015 at 01:38:37AM +0900, Gernot Hassenpflug wrote:
> 	.  .  .  .
>>>    found USB scanner (vendor=0x04a9, product=0x2774) at libusb:001:004
>          I can't find where the above line tells _exactly_ what
> 	 Canon backend is the appropriate one.  I think the above
> 	 tells me what the Canon backend should be, and also tells
> 	 me the USB port.
>> What version of SANE do you have installed? You can look at the package
>> libsane, e.g.
>> aptitude show libsane
>> (on my Debian unstable installation it is 1.0.24-13, although I also
>> install the latest development version in /usr/local)
>   	  The above call to aptitude tells me that I have
> 	      Version: 1.0.22-7.4
>> The MF4700 series has been in SANE since before December 2013, so unless
>> you are using an ancient version of SANE, it is most likely that you have
>> the backend you need in SANE.
>           I believe I do.  I remember seeing, back in April, that MF4770n
> 	  was supported.
>> The documentation in README.linux that comes with the SANE code should help
>> you check the installation and do some debugging, or at least specify to
>> the list which steps you managed to succeed in, and where things failed.
>          Thank you very much for this tip.  From README.linux, I learned:
> 	 "The device files used by libusb are located in /proc/bus/usb/
> 	   . . .or in /dev/bus/usb/".  For me, they are in
> 	 /dev/bus/usb/, which means, I guess, that I am running udev.
> 	 I also put the line   USB_DEVFS_PATH=/dev/bus/usb   into
> 	 my .bashrc.  But the call to    scanimage >image.pnm  still
> 	 fails.  My USB socket lights blink furiously, eventually
> 	 the call returns with    no SANE devices found    and
> 	 I am left with an empty file, image.pnm, which I then delete.
>> /usr/share/doc/libsane/README.Debian.gz (a Debian-specific file with a
>> trouble-shooting section)
>   	 This didn't help me.
> 	 I think I must be close<g>.  But even though I know that
> 	 the scanner is seen, and I know the ports in /dev/bus/usb,
> 	 I can't get scanimage to work.  I hope for further suggestions.
> Alan

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