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Hi, this issue affects my hosts as well. I have about 40 hosts running Intel X550s that were working fine on kernel 4.4.0-141-generic with regard to negotiating 10Gb automatically. Suddenly after booting into 4.15.0-43-generic they automatically negotiate at 1Gb. I have to use ethtool to force them to 10Gb.
These are all Dell R640 so I don't think the issue is tied to the Asus x299. Seems more tightly correlated with the Intel X550 and the kernel version (4.15+ for me).
I tried the 5.0-rc3 kernel you linked and the issue still exists there. So, somewhere between 4.4 and 4.13 the issue started and it still has not been fixed.