Looks like the patch to fix this issue is now in the upstream kernel.
I'll cherrypick the patch and build a Karmic test kernel for everyone to
test.  Please stay tuned . . .

ogasaw...@emiko:~/linux-2.6$ git show 7af25b4b34a2439020d78da765a3bed0ff73f25c
commit 7af25b4b34a2439020d78da765a3bed0ff73f25c
Author: Oliver Neukum <oli...@neukum.org>
Date:   Tue Sep 8 23:51:28 2009 +0200

    USB: fix cdc-acm regression in open
    
    cdc-acm needs to set a flag during open to tell the
    tty layer that the device is initialized
    
    Signed-off-by: Oliver Neukum <oli...@neukum.org>
    Cc: Marcel Holtmann <mar...@holtmann.org>
    Cc: Paul Martin <p...@debian.org>
    Cc: stable <sta...@kernel.org>
    Signed-off-by: Greg Kroah-Hartman <gre...@suse.de>

** Changed in: linux (Ubuntu)
       Status: Triaged => In Progress

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Leann Ogasawara (leannogasawara)

-- 
regression -  Ericsson F3507g (e.g. 0bdb:1900) WWAN Card not detected after 
2.6.27-10 kernel
https://bugs.launchpad.net/bugs/334413
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