I never know how to do it out of my head, but usually it involves disabling ASPM L0/L1 states using setpci on the device. Regarding i226-V, I’ve had a good experience with it, however I remember reading issues for some users when using EEE, but there are so many NICs and switches that fail at EEE the I’m not seeing that as anything new.
How make Rock5B's 22x30mm M.2 PCIe slot work on Linux?
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Thanks for confirming that the Intel i225 NIC is a broken model, that was never fixed - and that the fixed version was released under the separate product name Intel i226.
That’s a big embarrasment for Intel.