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[Konilabs <koni@xxxxxxxxxxxx>]

Hi, I have exactly the same issue.
I use Xubuntu 15.04 with a Canon Pixma MG5350 printer.

I added James Ring PPA and updated sane package, and this solved the issue.
Please put the fix in official repository :)

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https://bugs.launchpad.net/bugs/1512027

Title:
  open of device pixma:MX7600_... failed: invalid argument

Status in sane-backends package in Ubuntu:
  Confirmed

Bug description:
  Up until recently, I've been able to scan fine with my Canon Pixma
  MX7600. Then I upgraded to Ubuntu Wily and I've started getting:

  $ scanimage
  scanimage: open of device pixma:MX7600_192.168.2.107 failed: Invalid argument

  The device pings and I can get to its HTTP port. Everything appears
  OK.

  If I run

  strace -f -s 256 -o /tmp/trace.txt scanimage

  the relevant output appears to be:

  socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP) = 204
  connect(204, {sa_family=AF_INET, sin_port=htons(8612),
  sin_addr=inet_addr("192.168.2.107")}, 16) = 0
  sendto(204, "BJNP\2\1\0\0\0\0\0\0\0\0\0\0", 16, 0, NULL, 0) = 16
  select(205, [204], NULL, NULL, {4, 0}) = 1 (in [204], left {3, 998257})
  recvfrom(204, "BJNP\202\1\0\0\0\0\0\0\0\0\0\20\0\1\10\0\6\4\0\0\205\316\356\343\300\250\2k",
  2048, 0, NULL, N
  ULL) = 32
  close(204)
  write(2, "scanimage: open of device pixma:MX7600_192.168.2.107 failed:
  Invalid argument\n", 78) = 78

  It appears to me that the scanner is responding but the driver doesn't
  like the response. I'm running sane 1.0.14-11 and sane-utils
  1.0.25+git201505.

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