IIRC, initially the device powers exposing a profile that includes a USB
cdrom (designed for storing MS Windows driver software not required for
Linux).  A kernel module then pokes the device into a mode that no
longer shows the cdrom profile (and instead presents an additional
serial port).

So perhaps it's a case of a serial driver implicitly hardcoded to
presume that it's talking to a usb-serial endpoint, when in fact it
might not be.  I'm guessing that what we've had (working) for the last
year is merely to blacklist and ignore the cdrom interface, whereas
instead nothing *should bind* to it until it's been switched into
another profile.

-- 
Oops randomly with Huawei E220 3G dongle (regression)
https://bugs.launchpad.net/bugs/430011
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