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    SubjectForcedeth: Nvidia NIC goes up and down
    From
    Date
    Hi

    I recently invested in a asus m2n-mx. The motherboard features a nvidia
    1gbit NIC (lspci says 00:07.0 Bridge: nVidia Corporation MCP61 Ethernet
    (rev a2)). I have it connected to my 1gbit switch together with another
    machine. The problem is that very frequently (sometimes several times
    each minute), the NIC goes down for a few seconds and then goes up
    again. In the dmesg log I can see:

    Jul 2 21:01:26 [kernel] eth0: link down.
    Jul 2 21:01:28 [kernel] eth0: link up.
    Jul 2 21:01:57 [kernel] eth0: link down.
    Jul 2 21:01:59 [kernel] eth0: link up.
    Jul 2 21:02:34 [kernel] eth0: link down.
    Jul 2 21:02:36 [kernel] eth0: link up.
    Jul 2 21:03:15 [kernel] eth0: link down.
    Jul 2 21:03:18 [kernel] eth0: link up.

    I've tried changing the cable and changing the port in the switch
    without luck.

    Sadly the motherboard only has 2 pci slots, which is already taken, so
    adding another NIC is not an option. The wireless interface is working
    perfectly fine on the machine so the problem seems related to the NIC.

    I've tried fiddling with ethtool but I can't seem to make the NIC run at
    100mbit. If I disable autoneg nothing seems to be working. Output from
    ethtool:

    Settings for eth0:
    Supported ports: [ MII ]
    Supported link modes: 10baseT/Half 10baseT/Full
    100baseT/Half 100baseT/Full
    1000baseT/Full
    Supports auto-negotiation: Yes
    Advertised link modes: 10baseT/Half 10baseT/Full
    100baseT/Half 100baseT/Full
    1000baseT/Full
    Advertised auto-negotiation: Yes
    Speed: 1000Mb/s
    Duplex: Full
    Port: MII
    PHYAD: 1
    Transceiver: external
    Auto-negotiation: on
    Supports Wake-on: g
    Wake-on: d
    Link detected: yes

    Any idea how what I can do to debug this issue further?

    Please cc me as I'm not subscribed. Thanks in advance

    --
    Anders Rune Jensen

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