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Thank you for posting in Wired Communities. Have you tried contacting Dell* support for the customized driver? What is the out put of the ethtool -i command?
I have the same issue here. So I downloaded the driver and did make install. It compiles fine but I didn't see NIC gets detected from dmsg.
ljin@li-Tower-3620-14:~/Downloads/igb-22.214.171.124/src$ uname -a
Linux li-Tower-3620-14 3.13.0-32-generic #57-Ubuntu SMP Tue Jul 15 03:51:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
ljin@li-Tower-3620-14:~/Downloads/igb-126.96.36.199/src$ dmesg | tail
[36192.577111] perf samples too long (2524 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
[60863.231197] Intel(R) Gigabit Ethernet Network Driver - version 188.8.131.52
[60863.231203] Copyright (c) 2007-2015 Intel Corporation.
ljin@li-Tower-3620-14:~/Downloads/igb-184.108.40.206/src$ lsmod | grep igb
igb 194328 0
ptp 18933 1 igb
dca 15130 1 igb
ljin@li-Tower-3620-14:~/Downloads/igb-220.127.116.11/src$ inxi -SNxz
System: Host: li-Tower-3620-14 Kernel: 3.13.0-32-generic x86_64 (64 bit, gcc: 4.8.2)
Desktop: Gnome Distro: Ubuntu 14.04 trusty
Network: Card-1: Intel Ethernet Connection (2) I219-LM bus-ID: 00:1f.6
Card-2: MosChip MCS7830 10/100 Mbps Ethernet adapter driver: MOSCHIP usb-ethernet driver usb-ID: 001-003
BTW since the interface doesn't show up, I can't use ethtool to dump out the information. I traced the code a bit and found the probe function is not called.