usb modem fails in minicom; no tty for cdc_acm?

[John Reiser]

Has anyone gotten a usb modem, or other usb tty device, to work under
Fedora Core 3 test 1?

The old /dev/input/ttyACM0 apparently is no longer the correct path.
As with all other usb devices, the hotplug machinery and usbdevfs
must be used.  Please post an example of how to get /dev/modem
symlinked to the right name [such as /proc/bus/usb/002/002], and
how to chmod it for use by whoever is logged in at the console,
and how to have this all work even when the modem is plugged in
and turned on at boot [something like "persistent hotplug",
without requiring that the modem be unplugged ard re-plugged
at every boot.]

Even after doing everything manually, minicom still does not work.
All the tty ioctl() calls fail, and there is no actual communication
with the modem.  See
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=127951 for details.

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