If two USB sound cards that have the same serial number are plugged in make sure ID_ID is unique at least during runtime, by including the ALSA card id in the ID_ID string. Fixes issues like this one: http://pulseaudio.org/ticket/661
http://git.altlinux.org/people/shrek/packages/?p=udev.git;a=commitdiff;h=4c0de2b7ef70494a333993d5ddb493ccc06967cb