I'm a little too late I guess, but I still hope this will get into wheezy-backports someday. This is a patch for python-cups 1.9.48 which introduces the support for IPP_TAG_RESOLUTION. This should fix the bug for this version (works on my machine, at least).
Used this commit for patch: https://git.fedorahosted.org/cgit/pycups.git/commit/?id=34d07f5d6489af1f5895ee210dc8ec130583903a The debdiff is in the attachment.
pycups-debdiff
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