Same issue - we are connecting to a 1000Base-LX device with an Intel XL710 and a E10GLR optic.
We are using the latest driver and the latest NVM. Machine is a Dell R330 with firmware supplied by Dell.
configuration: autonegotiation=off broadcast=yes driver=i40e driverversion=1.5.25 duplex=full firmware=5.04 0x800024c9 17.5.11 latency=0 link=yes multicast=yes port=fibre speed=10Gbit/s
Oddly, if the remote side is a X520-DA2 with a E10GLR optics, and a force that side to 1G, I get link and can ping. However, no 3rd party 1000Base-LX devices get link.
We are also deeply disappointed that DOM (ethtool -m) support has not been written into the i40e driver.
Please advise.