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

Mikkel L. Ellertson mikkel at infinity-ltd.com
Sat Dec 20 17:33:19 UTC 2008


Frank Cox wrote:
> 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
> 
I am glad to hear you have it working.

Maybe a HAL rule to eject the SCSI device the Novatel as soon as it
is detected? Or a udev rule that does the same thing? Just as a
temporary fix? If I remember right, it has different device IDs in
drive and modem modes.

Mikkel
-- 

  Do not meddle in the affairs of dragons,
for thou art crunchy and taste good with Ketchup!

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