It might be an idea to apply this patch to your udev packages: http://git.kernel.org/?p=linux/hotplug/udev.git;a=patch;h=ed1b2d9fc7d5c5bfe2a67b0b8ff9e5ea8694268e Allows users to plug in two identical USB sound cards that share the same serial numbers. Unfortunately most USB cards actually have a fixed (i.e. invalid) serial number, so this fixes a pretty common case -- at least as long as you consider plugging in two usb cards a common case ;-) Lennart -- Lennart Poettering Red Hat, Inc. lennart [at] poettering [dot] net http://0pointer.net/lennart/ GnuPG 0x1A015CC4