Comment # 5 on bug 909567 from Johannes Meixner

According to
http://www.sane-project.org/cgi-bin/driver.pl?manu=&model=&bus=any&v=04a9&p=177c
only the pixma backend included in the SANE development repository
might support the Canon PIXMA MG7500 via USB (but it is untested).

I made sane-backends version git20150108 RPMs for openSUSE 13.1 and 13.2
which is an unstable development source only for testing, without
any guarantee or warranty, and without any support from openSUSE
in my openSUSE build service home project "home:jsmeix".

Please read
https://build.opensuse.org/project/show?project=home:jsmeix

You can get the packages in the "home:jsmeix" project
for example for openSUSE 13.1 from this direct URL
http://download.opensuse.org/repositories/home:/jsmeix/openSUSE_13.1/

When you like to upgrade an installed sane-backends 1.0.23 or 1.0.24
to sane-backends development version git20150108 you need
to install version git20150108 with plain rpm using "--force"
e.g. use a command like

  rpm -Uhv --force sane-backends-git20150108-2.1.x86_64.rpm

because for rpm the version number git2015010 is lower than
the installed version number 1.0.23 or 1.0.24.

Perhaps you are a venturous openSUSE user who likes to try out
if sane-backends development version git20150108 works for you?
If yes, please report whether or not it works for you.
Many thanks in advance for testing it and for your feedback!

Caution:
When you try it out and your scanner makes bad-sounding noises
the usual reason is that the scanner's internal moving parts
"do bad things" which means the scanner hardware could get damaged
(for a current example see bug#897855).

If there are issues with the pixma backend/driver:

I do not have a scanner that uses the pixma backend so that
I cannot do anything here (in particular I cannot debug it).

We (i.e. openSUSE) distribute sane-backends from the SANE project
but we do not develop scanner drivers.
In particular I don't have any knowledge about the pixma driver.

If there are issues with scanner drivers I recommend to report
them directly to the driver authors at the SANE project
http://www.sane-project.org
so that there is a direct communication between you
and the upstream authors.

The best way is to post on the sane-devel mailing list so that
the upstream authors plus interested users can notice the issue, see
http://www.sane-project.org/mailing-lists.html