I have the same problem with my Canon EOS 400D, as reported in bug #6602. The workaround there works for me. From lsusb:
Bus 004 Device 016: ID 04a9:3110 Canon, Inc. -- Can't Import Photos from Canon EOS Digital Rebel XTi https://launchpad.net/bugs/63473 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
