[mako/flipped] rmnet_usb devices are visible to NM, which tries to configure them

[Tony Espy]

On the non-flipped image, running the command 'nmcli dev' shows two devices:

/ril_0 gsm disconnected
wlan0 802-11-wireless disconnected

Whereas on the flipped image, an additional four ethernet devices are shown:

rmnet_usb3 802-3-ethernet unavailable
rmnet_usb0 802-3-ethernet unavailable
rmnet_usb2 802-3-ethernet unavailable
rmnet_usb1 802-3-ethernet unavailable

This related to LP: #1193161, which *may* now be resolved.

NetworkManager actually tries to configure these devices, which is incorrect as they're owned by RILD.

So, we need to figure out some way to prevent NM from doing anything with these devices until ofono gives the OK.

[Mathieu Trudel-Lapierre (cyphermox)]

This would go substancially better with debug logs, but since we pretty much know what's going on...

The issue is that when non-flipped (Ubuntu in a container), NM is unable to figure out the driver and just ignores the interface altogether.

In flipped, it sees the device and correctly identifies the driver, which causes the device to be managed. Then carrier detection appears to cause automatic connections to get started.

Two options: make the device ignored altogether and carry on as before, or perhaps a bit nicer (because then you can ask NM about connection states and stuff), have it not do carrier detection.

I'll test the latter, and go with the former if testing fails.

[Tony Espy (awe)]

@Mathieu

The original bug is still broken, it appears I jumped the gun claiming that it was working:

https://bugs.launchpad.net/touch-preview-images/+bug/1193161/comments/13

Also, logs were attached to the original bug for both flipped and non-flipped images.

Do you have a Nexus4 to reproduce?

Let me know if there's anything else I can do to help.