Re: USB GSM modem dongle problems

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On Wed, May 09, 2012 at 04:21:29PM -0500, Dan Williams wrote:
> That's a firmware crash in the modem.  It could be "caused" by whatever
> program you have that controls the modem (ModemManager maybe?); even
> though the firmware should never crash, if the modem receives input it
> does not expect, it might crash.  Usually here the program has to work
> around these sorts of firmware bugs, and to do that you'd need logs to
> see what is happening right before that crash.
> 

Aha, interesting. For the connection I use ppp (2.4.5) and as a link
setup helper either wvdial or chat. 

The problem occurs after many hours of being online so the link setup
part is unlikely the source. What kinds of things might be sent well
into an active ppp session to the modem to crash the firmware?

How would I log things as you suggest? I already use the ppp debug
option and the logs shows no special control packets just prior to the
crash.

I do sometimes hibernate/resume with the dongle plugged in though the 
connection is always closed. Might things be getting corrupted across
suspend cycles?

~ Andy
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