I'm pushing on Dell to push on Intel. Not getting a lot of traction on that but I'll update if I do. Definitely have this issue on all my Dell R640s with X550s though.
I also suspect the ixgbe module here. The kernel 4.4.0-141 version is 4.2.1. Going to Ubuntu's 4.15.0-43 kernel takes it to 5.1.0 where the 1Gb negotiation issue pops up. I also tried upgrading ixgbe to 5.5.5 and saw the same issue, so it isn't fixed yet or anything.
I'm pushing on Dell to push on Intel. Not getting a lot of traction on that but I'll update if I do. Definitely have this issue on all my Dell R640s with X550s though.
I also suspect the ixgbe module here. The kernel 4.4.0-141 version is 4.2.1. Going to Ubuntu's 4.15.0-43 kernel takes it to 5.1.0 where the 1Gb negotiation issue pops up. I also tried upgrading ixgbe to 5.5.5 and saw the same issue, so it isn't fixed yet or anything.