At some point along the line this bug has been fixed:
kjotte@mystic:/tmp/sane-backends-1.0.27/backend$ grep -n gethostbyname pixma*
kjotte@mystic:/tmp/sane-backends-1.0.27/backend$ grep -n getaddrinfo pixma*
pixma_bjnp.c:849: if (getaddrinfo(host , service, NULL, ) == 0)
pixma_bjnp.c:1714:
Note: Initial bug report was made under 12.10, but the following retest
performed under 14.04.1.
We seem to have a couple of different problems, both indicating a lack
of IPv6 support.
1) Scanner detection over the network is performed with BJNP, and the
specification seems to be tied to using
I have located the problem of specifying the scanner directly in the
backend config.
kjotte@mystic:/tmp$ apt-get source sane-backends
...
kjotte@mystic:/tmp/sane-backends-1.0.23/backend$ grep -n gethostbyname pixma*
pixma_bjnp.c:1145: result = gethostbyname (hostname);
This will need to be
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: sane-backends (Ubuntu)
Status: New = Confirmed
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https://bugs.launchpad.net/bugs/1160650