Hey,
I recently bought a Thinkpad T470 notebook and added the Fibocom
L831-EAU WWAN card. It's mbim-based, but unfortunately I can't get it to
work correctly. In fact I'm experiencing similar issues to Patrick
Chilton, who reported this behaviour a few months ago also on this list:
https://www.spinics.net/lists/linux-usb/msg158286.html
After a new boot, the card works for me for a few minutes, then all
transfers stall. Finally, I receive the infamous 'cdc_mbim 1-6:1.0:
nonzero urb status received: -EPIPE' message in my system log.
I also tried to disable MBIM by adding an option to modprobe. During
connect, pppd then just hangs up (again similar to what Patrick Chilton
experienced).
I'm on Arch Linux and Kernel 4.12.13, I tried with and without
NetworkManager/ModemManager.
Any ideas how I might be able to debug this?
Thanks,
Andreas
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