Intel I219-LM network interface card not detected

Hi,

I see this has been asked before and based on the favourable answer given by @cryptochrome, almost two years ago - to the day, I went ahead and bought a SuperMicro X11SSV-LVDS motherboard, confident that I would not have any NIC issues, however UTM 9.509-3 is not detecting the I219-LM NIC. 

The motherboard comes with two onboard nics: "Intel Ethernet Controller I210-AT and Intel Ethernet Connection I219-LM Phy with AMT". 

I am assuming the "-LM Phy with AMT" is not causing the problem.

@cryptochrome mentions the supported kernel version as 3.19.x, however, I notice UTM 9.509-3 is running 3.12.74-0:

    # uname -r

  3.12.74-0.283050698.g2cded84.rb2-smp64

or

    # cat /proc/version
   Linux version 3.12.74-0.283050698.g2cded84.rb2-smp64 (abuild@axgbuild) (gcc version 4.3.4 [gcc-4_3-branch revision 152973] (SUSE Linux) ) #1 SMP Mon Feb 5 12:05:55 UTC 2018

Has there been a regression in the kernel version? However, two posts further down, @williamWarren states it is supported in kernel 3.12.x

I've built the appliance in a small ITX case and there is no room for a PCI card and I don't really want to buy another, larger case to fit a PCI NIC.

I've seen another post that states both NICs have to be the same. Is this true?

All said and done, is there anything I can do to get the I219 NIC to work without buying more hardware?

Many thanks

W.