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A comment on Reliable 25 Gigabit Ethernet via Thunderbolt. Parent comment

Re:Reliable 25 Gigabit Ethernet via Thunderbolt by kohlschuetter on Sunday February 01, 2026 @09:10AM (#46846335)
Disconnected as in "network"? What PCIe card do you use? Can you update the firmware (maybe from Windows)?

Also check the BIOS settings (try setting TB security to "No Security" or "User Authorization")

Some OEM Mellanox cards can be cross-flashed to NVIDIA's stock firmware, maybe that's also relevant.

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Re:Reliable 25 Gigabit Ethernet via Thunderbolt by madduci on Sunday February 01, 2026 @01:31PM (#46848178)
It's embedded in the laptop (a HP ZBook from work). Disconnected as in network. Laptop charges, but signal doesn't work. With Thunderbolt 3 devices, it works. (The card itself is T4).
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