What is the last step to use my scanner?

Question

I have a Canon DR-1210C USB Scanner.

It is recognized by the kernel when plugged in:

[5365651.911506] usb 2-2.1: USB disconnect, address 3
[5365661.952066] usb 2-2: USB disconnect, address 2
[5365683.268060] usb 2-2: new full speed USB device using uhci_hcd and address 4
[5365683.441019] usb 2-2: New USB device found, idVendor=1083, idProduct=160f
[5365683.441027] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[5365683.441033] usb 2-2: Product: CANON   DR-1210C        
[5365683.441037] usb 2-2: Manufacturer: CANON   
[5365683.441248] usb 2-2: configuration #1 chosen from 1 choice

sane-find-scanner can see it:

 # sane-find-scanner will now attempt to detect your scanner. If the
  # result is different from what you expected, first make sure your
  # scanner is powered up and properly connected to your computer.

  # No SCSI scanners found. If you expected something different, make sure that
  # you have loaded a kernel SCSI driver for your SCSI adapter.

found USB scanner (vendor=0x1083 [CANON   ], product=0x160f [CANON   DR-1210C        ], chip=GL845) at libusb:002:004
  # Your USB scanner was (probably) detected. It may or may not be supported by
  # SANE. Try scanimage -L and read the backend's manpage.

  # Not checking for parallel port scanners.

  # Most Scanners connected to the parallel port or other proprietary ports
  # can't be detected by this program.
  # sane-find-scanner will now attempt to detect your scanner. If the
  # result is different from what you expected, first make sure your
  # scanner is powered up and properly connected to your computer.

  # No SCSI scanners found. If you expected something different, make sure that
  # you have loaded a kernel SCSI driver for your SCSI adapter.

found USB scanner (vendor=0x1083 [CANON   ], product=0x160f [CANON   DR-1210C        ], chip=GL845) at libusb:002:004
  # Your USB scanner was (probably) detected. It may or may not be supported by
  # SANE. Try scanimage -L and read the backend's manpage.

  # Not checking for parallel port scanners.

  # Most Scanners connected to the parallel port or other proprietary ports
  # can't be detected by this program.

But scanimage -L says no scanner.

No scanners were identified. If you were expecting something different,
check that the scanner is plugged in, turned on and detected by the
sane-find-scanner tool (if appropriate). Please read the documentation
which came with this software (README, FAQ, manpages).

So what is it that I have missed? I tried following the HOWTO but it's not giving me any insight based on the troubleshooting advice.

Answer 1

This is typical if the user that runs scanimage doesn't have rights to access the device. You can check which group the device belongs to using:

ls -la /dev/bus/usb/002/004

(the 002/004 part was taken from your sane-find-scanner output) and make sure that the user saned is member of the group owning the device. Make sure to restart the saned daemon after that change.