Comment 105 for bug 260918

Fabian, the bug you have is not entirely based on the libv4l issue. First of all you have to get rid of zc0301 to be able to use gspca_zc3xx, and then apply LD_PRELOAD=v4....
it is not enough to blacklist, you have to compile a new version of gspca

see here for a complete solution:
https://bugs.launchpad.net/ubuntu/+bug/293259

so in addition to the problem with having to preload the v4l1-compat library for some cameras that might use zc0301, sn9c102 or other non-gspca drivers, the webcam drivers must be recompiled. Look here for a more professional description:
http://bugzilla.kernel.org/show_bug.cgi?id=11920