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I have Ericsson H5321gw WWAN modem (USB ID 0bdb:1926) on my Lenovo X230 laptop. I've got it working momentarily using NetworkManager GUI on Gnome3. Normally I can make it connect for a few minutes only to see the whole device being removed from NetworkManager later by itself. So technically it is working, but somehow the device keeps getting removed after a while (causing disconnection, of course). Initially I thought this might be an issue of USB Autosuspend power saving functionality but I have tried setting it off like so:

for i in /sys/bus/usb/devices/*/power/autosuspend; do echo -1 > $i; done

I have Debian Jessie with 3.10-3-amd64 kernel.

This is an example log from test where I got disconnected right away after connecting: http:// bGbTHGri (url pasting limit, sorry)

This is another test where I got disconnected after being connected for about 2 minutes:

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same problem here - did you ever figure this out? – vorburger Mar 3 '15 at 18:00

Ok, figured this out. You need to:

sudo cp /lib/udev/rules.d/77-mm-ericsson-mbm.rules /etc/udev/rules.d/ 

and then edit it to add an entry matching your card's lsusb output. That solved this for me.
Full blurb on my

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I gave up with the WWAN modem and started to use tethering on my cell phone instead. I'll try this out sometime and see if it works. Thanks for input! – azyr Mar 4 '15 at 10:59
PS: Note… re. a (minor..) suspend/resume issue I'm seeing with this card. – vorburger Mar 5 '15 at 8:02

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