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[Chris Valean <cvalean@xxxxxxxxxxxxxxxxxxxxxx>]

A few more details on this, on 14.04 the legacy adapter seems to be
handled through the tulip driver. However, on Vivid the PCI device is
still recognized, but not shown as handled through any kernel module:

#lspci
00:00.0 Host bridge: Intel Corporation 440BX/ZX/DX - 82443BX/ZX/DX Host bridge (AGP disabled) (rev 03)
00:07.0 ISA bridge: Intel Corporation 82371AB/EB/MB PIIX4 ISA (rev 01)
00:07.1 IDE interface: Intel Corporation 82371AB/EB/MB PIIX4 IDE (rev 01)
00:07.3 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 02)
00:08.0 VGA compatible controller: Microsoft Corporation Hyper-V virtual VGA
00:0a.0 Ethernet controller: Digital Equipment Corporation DECchip 21140 [FasterNet] (rev 20)

Ethernet controller info:
00:0a.0 Ethernet controller: Digital Equipment Corporation DECchip 21140 [FasterNet] (rev 20)
        Subsystem: Device 0a00:2114
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
        Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 64 (5000ns min, 10000ns max), Cache Line Size: 32 bytes
        Interrupt: pin A routed to IRQ 11
        Region 0: I/O ports at ec00 [size=128]
        Region 1: Memory at febff000 (32-bit, non-prefetchable) [size=4K]
        Expansion ROM at febe0000 [disabled] [size=64K]

On 14.04 the last command reads also this line:
Kernel driver in use: tulip

** Changed in: linux (Ubuntu)
       Status: Incomplete => New

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https://bugs.launchpad.net/bugs/1440072

Title:
  [Hyper-V] Legacy network adapter is not detected

Status in linux package in Ubuntu:
  New

Bug description:
  Issue description:
  Attaching a Legacy network adapter to a VM will not be detected on the VM side.
  This is not the case with synthetic adapters, which are properly identified.

  Steps to Reproduce: 
  1.     Add a Legacy Network adapter to the VM
  2.     Boot the vm
  3.     Verify the identified network adapter, the legacy NIC is missing

  Versions details:
  Windows Server Host Edition: Microsoft Windows Server 2012 R2 Datacenter build 9600 and Microsoft Windows Server 2008 R2 Standard  SP 1 build 7601
  Distribution name and release: Ubuntu Vivid Vervet
  Kernel version: Linux ubuntu31 3.19.0-11-generic #11lp14233432v201504021617 SMP

  
  Hyper-V side:
  PS> Get-VMNetworkAdapter -VMName vivid1

  Name                   IsManagementOs VMName SwitchName MacAddress   Status IPAddresses
  ----                   -------------- ------ ---------- ----------   ------ -----------
  Network Adapter        False          vivid1 external   00155D06332D {Ok}   {IP, fe80::215:5dff:fe06:332d}
  Legacy Network Adapter False          vivid1 external   00155D063336 {Ok}   {}

  On the VM Side:
  root@ubuntu31:~# ls /sys/class/net/
  eth0  lo

  eth0 has the MAC of the Network Adapter, which is the synthetic
  interface.

  This has been verified with also 1 vCPU or with irqbalancer daemon
  disabled, as that is a common requirements when using legacy adapters.

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