AW: [Telit LE910-EU1] mbimcli -disconnect error

Matthias Mielke Mielke at
Fri Aug 4 15:14:36 UTC 2017

Hi Aleksander, Carlo & Daniele,


thanks for the fast reply!


Before the disconnection I get connected to the network using mbim-network /dev/cdc-wdm0 start.

My kernel version is 3.18.0-linux4sam_5.0-alpha3

Telit revision: LE910_EU1_1G-20.00.410.B101


I’m not available over the weekend, I will answer Monday again!





> I cannot find this thread in the mailinglist

nevermind, I was checking the modemmanager's one


On Fri, 4 Aug 2017 at 15:43 Carlo Lobrano <c.lobrano at <mailto:c.lobrano at> > wrote:

Hi Aleksander,

I used LE910 in mbim mode for some time (even if not recently), but I don't remember such problem, I need to check it again. 

I cannot find this thread in the mailinglist, so I don't have all the info, what's the use case? What happens before the disconnection? (kernel version?)


On Fri, 4 Aug 2017 at 15:30 Aleksander Morgado <aleksander at <mailto:aleksander at> > wrote:

Hey Matthias, Carlo & Daniele,

On 04/08/17 13:40, Matthias Mielke wrote:
> usb 1-2: USB disconnect, device number 31
> cdc_mbim 1-2:1.12: Unexpected error -71
> cdc_mbim 1-2:1.12 wwan0: unregister 'cdc_mbim' usb-700000.ehci-2, CDC MBIM
> usb 1-2: new high-speed USB device number 32 using atmel-ehci
> usb 1-2: USB disconnect, device number 32
> usb 1-2: new high-speed USB device number 33 using atmel-ehci
> cdc_mbim 1-2:1.12: setting rx_max = 16384
> cdc_mbim 1-2:1.12: cdc-wdm0: USB WDM device
> cdc_mbim 1-2:1.12 wwan0: register 'cdc_mbim' at usb-700000.ehci-2, CDC MBIM,
> 72:a6:7a:22:88:b7
> The errors above seem to occur in around 50% of the cases I use the
> --disconnect  command, the other 50% are working fine and the modem gets
> disconnected from the network successfully.
> Still, after successful disconnect, the modem is also disconnecting from the
> USB.
> Can someone of you kind people assist me with my problem?

I believe I'm going to blame this on buggy firmware. When you get the "unexpected port hangup" it means the modem went away from the USB subsystem, it power-cycles itself.

Carlo, Daniele, have you seen any such thing with a Telit LE910 in MBIM mode?


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