Bug 93392

> Please direct me to contact with appropriate Linux kernel developers if you
> see this way as more reasonable. Or is it reasonable to support older QMI
> nas/dms versions in ModemManager ?

Could you get us ModemManager debug logs to see why MM doesn't like the device? FYI, old QMI versions should be totally supported; if for some reason a given method is not available we just log about it and keep on. The core functionality required to get the modem connected should be available even in very old QMI service versions.

To get debug logs, see:
http://www.freedesktop.org/wiki/Software/ModemManager/Debugging/

Dear Aleksander,

Most of debugging logs taken from MM&NM I attached to the referred Launchpad ticket (I can copy them here if you need, I just think they are easily reviewable in Launchpad). MM first complains about low nas&dms versions, then reports 'DeviceUnsupported' and 'QMI operation failed: Transaction timed out'

One fresh addition from today : I had to apply the same workaround to enable operation of another HUAWEI CDMA modem with USB ids 12d1:140c. Same symptoms and same workaround (only a bit different versions of nas/dms services)

That's all on Debian 8.2 with kernel 3.16.x and MM 1.4.0-1

(exact model is printed on its sticker as Huawei EC167)

> 
> Most of debugging logs taken from MM&NM I attached to the referred Launchpad
> ticket (I can copy them here if you need, I just think they are easily
> reviewable in Launchpad). MM first complains about low nas&dms versions,
> then reports 'DeviceUnsupported' and 'QMI operation failed: Transaction
> timed out'
> 

No, there are no debug logs in Launchpad either, I had already checked that. We would need the debug logs to see what are the contents of the QMI messages being sent and to detect which one got timed out.

> One fresh addition from today : I had to apply the same workaround to enable
> operation of another HUAWEI CDMA modem with USB ids 12d1:140c. Same symptoms
> and same workaround (only a bit different versions of nas/dms services)
> 
> That's all on Debian 8.2 with kernel 3.16.x and MM 1.4.0-1

Would it be possible to test with the latest 1.4.12 stable release? That 1.4.0 is >1 year old.

Created attachment 120551 [details]
ModemManager debug log

Created attachment 120552 [details]
NetworkManager debug log

Dear Aleksander,

I collected some debug logs as described in 'Debugging' wiki page and attached their gzipped texts.

These logs were collected from fairly up-to-date Ubuntu Xenial testing system, with kernel 4.4.0-040400rc5-generic, network-manager 1.0.4-0ubuntu7 and modemmanager 1.4.12-1ubuntu1. I had 'U301' modem plugged in, with modules qmi_wwan and cdc_wdm allowed to load (not blacklisted). 

Please review and respond. Unfortunately tomorrow I need to return this modem back, but I will try to get some similar modems in my hands to give further info on this case.

(and btw, yes, the modem was not working same as with older kernel/mm/nm. blacklisting - did not test)

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You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.freedesktop.org/mobile-broadband/ModemManager/issues/69.