[Bug 323829] [NEW] cdc_acm driver lacks trival support for Conexant RD02-D400/Aztech UM3100 modem

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Dell is distributing Conexant RD02-D400 USB modems with new notebook
systems that have no internal modem.

These don't appear to be supported in Ubuntu 8.10, though the kernel
module changes required to get it to work are trivial, see
http://ubuntuforums.org/showthread.php?p=3684574

root at vostro:~# lsb_release -rd
Description:	Ubuntu 8.10
Release:	8.10

root at vostro:~# lsusb | grep Conex
Bus 002 Device 003: ID 0572:1324 Conexant Systems (Rockwell), Inc. 

The above link also shows that USB ID 0572:1328 should also be
supported.

Ubuntu 8.10 with latest updates on plug in of this device gives dmesg
entries as follows:

[10734.912211] cdc_acm: Zero length descriptor references
[10734.912214] 
[10734.913761] cdc_acm: probe of 2-1:1.0 failed with error -22
[10734.914918] usbcore: registered new interface driver cdc_acm
[10734.916027] cdc_acm: v0.26:USB Abstract Control Model driver for USB modems and ISDN adapters

root at vostro:~# ls -al /dev/ttyACM*
ls: cannot access /dev/ttyACM*: No such file or directory

** Affects: linux-meta (Ubuntu)
     Importance: Undecided
         Status: New

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cdc_acm driver lacks trival support for Conexant RD02-D400/Aztech UM3100 modem
https://bugs.launchpad.net/bugs/323829
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