I have a similar problem.  My Plextor PX-TV402U video capture device no longer 
works in Intrepid.  I do think I have rebuilt the drivers properly, but video 
devices are no longer appearing under /dev as expected in Intrepid.  MythTV and 
TVtime are expecting to find this device under /dev/video0.
lsusb output:
Bus 002 Device 005: ID 093b:a104 Plextor Corp. ConvertX PX-TV402U/NA
Bus 002 Device 003: ID 058f:6361 Alcor Micro Corp. Multimedia Card Reader
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 043d:0072 Lexmark International, Inc. X6170 Printer
Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

In case there is a connection to this other issue: In Gutsy and Hardy it
was necessary to edit /etc/init.d/mountdevsubfs.sh to allow usb devices
to mount at /proc/bus/usb but the same modification of
/etc/init.d/mountdevsubfs.sh did not work in Intrepid.  So I had to edit
my fstab file to mount usbfs and allow this USB video capture device to
be seen by the firmware loader.  It seems that several changes were made
in Intrepid regarding the handling of USB or video USB devices.

Please help to resolve this issue!  I am fairly new to Ubuntu but I will
offer additional information as needed.

-- 
Aiptek stv680 webcam doesn't register /dev/video* device after intrepid upgrade
https://bugs.launchpad.net/bugs/292379
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