I would expect wmx0 to show up in ifconfig anyway, unless you blacklist
the i2400m_usb module.  This is a 4G broadband device.

The actual network card on this system is an Atheros, which is still seen by 
lspci:
02:00.0 Ethernet controller [0200]: Atheros Communications Inc. AR8162 Fast 
Ethernet [1969:1090] (rev 10)
        Subsystem: Dell Device [1028:055b]
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 16
        Region 0: Memory at d0400000 (64-bit, non-prefetchable) [size=256K]
        Region 2: I/O ports at 2000 [size=128]
        Capabilities: <access denied>
        Kernel driver in use: alx
        Kernel modules: alx

The wired network device seems to be found at boot:
alx 0000:02:00.0: alx(84:8f:69:c6:d3:35): Qualcomm Atheros Ethernet Network 
Connection

I also have a system with a WiMAX device.  I also see it being listed as a 
wired device with nm-tool:
- Device: wmx0 -----------------------------------------------------------------
  Type:              Wired
  Driver:            i2400m_usb
  State:             unavailable
  Default:           no

However, it does not affect my real wired devcie:
- Device: eth0  [Wired connection 1] -------------------------------------------
  Type:              Wired
  Driver:            e1000e
  State:             connected
  Default:           yes

Do you see your Atheros wired device at all with nm-tool?

There could be two issues here:
1.  Network Manager is marking WiMAX as a wired device, which may or may not be 
desired.  I'll add a nm task to the bug, so this can be reviewed.  I also see 
my nm marked my WiMAX card as a wired device.
2.  The AR8162 device is not functioning properly, which could be driver 
related, since it appears in lspci.

Can you try a few tests?

1.   Does this system have a hardware switch or hot keys to disable wifi?  If 
so, can you disable wifi and reboot to see if the AR8162 device appears in 
ifconfig -a?  
2.  Can you rmmod then modprobe the alx driver to see if it will allow the 
AR8162 to appear?
3.  Can you also check that the AR8162 device has a link light.

** Also affects: network-manager (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1196496

Title:
  WiMAX - Intel Centrino Wireless-N + WiMAX 6150 BGN [8087:07d9] was
  detected as a Wired Network

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