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Re: Very slow-starting EVDO modem (WORK-AROUND FOUND)



On Wed, 3 Dec 2008 01:34:56 -0600
Frank Cox wrote:

> > As you can see, it took six minutes before the device somehow reset itself and
> > the machine realized that it had a modem attached.
> 
> I have now discovered what changes when the five minute delay is up.  As
> mentioned before, the modem takes 5 minutes before it creates the /tty/USB?
> devices.
> 
> Somehow, the modem changes its identity after being plugged in for 5 minutes.

Jamie Bernstein is also using a Novatel EVDO modem and he sent me a work-around
for this bug yesterday:

This command will cause the modem to immediately do its thing (reset?) and
create the /dev/ttyUSB? devices.

eject /dev/cdrom

After entering this command at a terminal prompt (or putting it
into /etc/rc.local if the modem is connected on boot-up) the modem immediately
starts working.  No 5 minute wait required.

Therefore, if there is some way that the kernel driver for this modem can issue
a similar "reset" command, the problem may go away.

I have added a note about this to the bug report at:

https://bugzilla.redhat.com/show_bug.cgi?id=473166


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