"You need a late version kernel. Kernel versions 2.2.7 and later
contain the USB code. You really need to be running the current
2.3.x kernel, ideally with any pre-patches for the next kernel. USB
code is in fairly early development, so the changes between each
version (and the bugs) tend to change fairly fast. Support on the
mailing list firstname.lastname@example.org for anything except the lastest
version is scant at best."