How make Rock5B's 22x30mm M.2 PCIe slot work on Linux?

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.

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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.