Reconnecting after disconnect not possible

Aleksander Morgado aleksander at
Thu Apr 30 14:12:40 PDT 2015

Ok, thanks, so this is a Sierra EM7305. There were recent reports of
this modem failing in MBIM mode but working in QMI mode, see:

You can try to switch to QMI mode by switching to USB interface
configuration #1; e.g. as the previous reporter did (you'll need to
specify the proper usb path):
echo 1 > /sys/bus/usb/devices/1-11/bConfigurationValue

I believe I do have one of these, I'll try myself this weekend.

On Thu, Apr 30, 2015 at 7:42 PM, Bernd Eggink <monoped at> wrote:
> On 30.04.2015 14:40, Aleksander Morgado wrote:
>> On Thu, Apr 30, 2015 at 6:30 PM, Bernd Eggink <monoped at> wrote:
>>> I tried that, didn't help. Actually I think the whole suspend-resume
>>> thing
>>> is a red herring. All tests I made showed that suspending and resuming
>>> does
>>> _not_ harm the connection, but _disconnecting_ does. In most cases after
>>> disconnecting the device I couldn't get a connection again, until the
>>> next
>>> boot. So the problem might be that after a disconnection the device is
>>> not
>>> properly reset to initial state.
>>> Also weird is the fact that when connecting times out, disabling (-d)
>>> also
>>> times out, resetting (-r) is not possible ("Cannot reset the modem:
>>> operation not supported") and simple-status says "state: connected" (!)
>> Which Sierra model is this? Can you get us "lsusb -v "of the device
>> and "mmcli -m 0" output?
> See the attached files.
> - Bernd
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