E3276: Failed to find primary AT port

Georg Lippitsch georg.lippitsch at gmx.at
Fri Jun 13 11:25:26 PDT 2014

Am 12.06.2014, 11:29 Uhr, schrieb Bjørn Mork <bjorn at mork.no>:

>> It's probably better to try recent kernel git, I will report when I
>> have done this.

Ok, I now tried with the 3.15 Kernel from here:

The Problem is the same: Modem works well when connected for the first  
time, but fails when re-pluged. No /dev/cdc-wdm0 anymore.
I also noticed that after unplugging the modem and unloading  
"huawei_cdc_ncm", the "cdc_wdm" module is still "Used by 1", and it's not  
possible to unload it.
This is not the case with my Huawei E398: After unpluging the modem, I can  
smoothly unload "cdc_wdm".

I also followed your discussion about buffer sizes in cdc_wdm. Do you  
think this could be related to the problem?
I'd also be happy to look in the source codes, if you could give me a hint  
where to start ;-)



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