Does this have any connection to the bug "i40e driver does not work with
kernel 4.15" described on https://bugs.launchpad.net/ubuntu/+source
/linux-meta-hwe/+bug/1779756 ?

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https://bugs.launchpad.net/bugs/1795587

Title:
  Upgrade i40e driver to support 6.01 Firmware - Intel XL710

Status in linux package in Ubuntu:
  Incomplete
Status in linux-firmware package in Ubuntu:
  Confirmed

Bug description:
  Intel released the 6.01 Firmware for the Intel XL710 network cards. As
  stated in the feature support matrix [1] in the table 9 on page 18,
  the minimum kernel driver version for the 6.01 Firmware i40e must be
  2.1.26, the recent driver version is 2.4.10 [2]

  The i40 driver version included in the 4.15.0-36 (Bionic, LTS) is
  2.1.14-k.

  $ uname -a
  Linux ubuntu-bionic 4.15.0-36-generic #39-Ubuntu SMP Mon Sep 24 16:19:09 UTC 
2018 x86_64 x86_64 x86_64 GNU/Linux

  $ modinfo i40e
  filename:       
/lib/modules/4.15.0-36-generic/kernel/drivers/net/ethernet/intel/i40e/i40e.ko
  version:        2.1.14-k
  license:        GPL
  description:    Intel(R) Ethernet Connection XL710 Network Driver

  Release notes: [3] [4] [5] [6] [7]

  The firmware 6.01 introduce better performance for DPDK and SR-IOV
  applications for those cards, and  NFV application workloads would
  perform better.

  
  [1] Intel® Ethernet Controller X710/ XXV710/XL710 Feature Support Matrix
  
https://www.intel.com/content/dam/www/public/us/en/documents/release-notes/xl710-ethernet-controller-feature-matrix.pdf

  [2] Intel® Network Adapter Driver for PCIe* 40 Gigabit Ethernet Network 
Connections Under Linux* 
  
https://downloadcenter.intel.com/download/24411/Intel-Network-Adapter-Driver-for-PCIe-40-Gigabit-Ethernet-Network-Connections-Under-Linux-?product=75021

  [3] Intel(R) Network Connections Software Version 23.2 Release Notes
  https://downloadmirror.intel.com/24411/eng/readme.txt

  [4] Intel(R) Network Connections Software Version 23.1 Release Notes
  https://downloadmirror.intel.com/27869/eng/readme.txt

  [5] Intel(R) Network Connections Software Version 22.10 Release Notes
  https://downloadmirror.intel.com/27547/eng/readme.txt

  [6] Intel(R) Network Connections Software Version 22.9 Release Notes
  https://downloadmirror.intel.com/27547/eng/readme.txt

  [7] Intel(R) Network Connections Software Version 22.6 Release Notes
  https://downloadmirror.intel.com/27189/eng/readme.txt

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