Strange behavior with ZTE MF821D (and possible other MDM9200 devices)

[Markus Gothe]

This is a know issue with some MF821D firmwares.
I believe it is due to some sort of hibernation mode.

//Markus - The panama-hat hacker

On 03 Dec 2013, at 15:48 , Kristian Evensen <kristian.evensen at gmail.com> wrote:

> Hei Bjørn,
> 
> On Tue, Dec 3, 2013 at 3:37 PM, Bjørn Mork <bjorn at mork.no> wrote:
>> The most likely cause of this is a modem firmware crash.  I don't think
>> there is much you can do about that, except trying to avoid the
>> situations which causes the crash or getting another modem.
> 
> Ok, that is what I suspected, thank you very much for letting me know.
> Then I guess we have to live with some work-arounds. One interesting
> observation is that the modem seems to reboot by itself and works just
> fine once the USB queue (probably not the correct name) has been
> flushed, so we will try to speed up the flush when packets with status
> -71 arrives. I guess this will be a special case solution and not
> something that should be submitted as a patch to the kernel.
> 
> Thanks again for the help,
> Kristian
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