ProxMox 9.1.2 on MS-01 cannot make i226-V come up

Hyadum

New Member
Dec 13, 2025
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Hello guys,
I recently purchased a MinisForum MS-01 and installed the latest ProxMox 9.1.2 build. The system is up to date in both UEFI, FW, OS and drivers.
The problem is that I cannot use the second LAN port, the one associated to the controller Intel Corporation Ethernet Controller I226-V (rev 04). There are no lights at all, and the link is not detected. While in UEFI, both ports have green+activity lights on. As soon as I boot into ProxMox, the i226-V turns off.

I have already tried a bunch of things, including going into UEFI and setting ASPM from Disabled to Auto, it did not change anything. I know I only have Cat5e cables and not Cat6 as required for 2.5G, but it should still work. I think the issue is that it doesn't do auto-negotiation, but I cannot force it either, it remains off. How can I make it work?

Code:
root@pve:~# ethtool nic1 <--- works fine with Cat5e cable

Settings for nic1:

        Supported ports: [ TP ]

        Supported link modes:   10baseT/Half 10baseT/Full

                                100baseT/Half 100baseT/Full

                                1000baseT/Full

                                2500baseT/Full

        Supported pause frame use: Symmetric

        Supports auto-negotiation: Yes

        Supported FEC modes: Not reported

        Advertised link modes:  10baseT/Half 10baseT/Full

                                100baseT/Half 100baseT/Full

                                1000baseT/Full

                                2500baseT/Full

        Advertised pause frame use: Symmetric

        Advertised auto-negotiation: Yes

        Advertised FEC modes: Not reported

        Speed: 1000Mb/s

        Duplex: Full

        Auto-negotiation: on <============

        Port: Twisted Pair

        PHYAD: 0

        Transceiver: internal

        MDI-X: off (auto)

        Supports Wake-on: pumbg

        Wake-on: g

        Current message level: 0x00000007 (7)

                               drv probe link

        Link detected: yes

root@pve:~# ethtool nic3 <--- doesn't work with Cat5e cable

Settings for nic3:

        Supported ports: [  ]

        Supported link modes:   10000baseT/Full

                                1000baseX/Full

                                10000baseSR/Full

                                10000baseLR/Full

        Supported pause frame use: Symmetric Receive-only

        Supports auto-negotiation: Yes

        Supported FEC modes: Not reported

        Advertised link modes:  10000baseT/Full

                                1000baseX/Full

                                10000baseSR/Full

                                10000baseLR/Full

        Advertised pause frame use: No

        Advertised auto-negotiation: Yes

        Advertised FEC modes: Not reported

        Speed: Unknown!

        Duplex: Unknown! (255)

        Auto-negotiation: off <============

        Port: Other

        PHYAD: 0

        Transceiver: internal

        Supports Wake-on: g

        Wake-on: g

        Current message level: 0x00000007 (7)

                               drv probe link

        Link detected: no <============

root@pve:~# lspci -nnk | grep -A3 57:00.0

57:00.0 Ethernet controller [0200]: Intel Corporation Ethernet Controller I226-V [8086:125c] (rev 04)

        Subsystem: Intel Corporation Device [8086:0000]

        Kernel driver in use: igc  <============

        Kernel modules: igc

root@pve:~# ip link show nic3

5: nic3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000

    link/ether 58:47:ca:7f:58:c1 brd ff:ff:ff:ff:ff:ff

    altname enx5847ca7f58c1

root@pve:~# lspci

02:00.0 Ethernet controller: Intel Corporation Ethernet Controller X710 for 10GbE SFP+ (rev 02)

02:00.1 Ethernet controller: Intel Corporation Ethernet Controller X710 for 10GbE SFP+ (rev 02)

57:00.0 Ethernet controller: Intel Corporation Ethernet Controller I226-V (rev 04)  <============

58:00.0 Ethernet controller: Intel Corporation Ethernet Controller I226-LM (rev 04)

59:00.0 Network controller: MEDIATEK Corp. MT7922 802.11ax PCI Express Wireless Network Adapter

root@pve:~# ip link set nic3 down

ethtool -s nic3 autoneg on

ip link set nic3 up

ethtool nic3

Settings for nic3:

        Supported ports: [  ]

        Supported link modes:   10000baseT/Full

                                1000baseX/Full

                                10000baseSR/Full

                                10000baseLR/Full

        Supported pause frame use: Symmetric Receive-only

        Supports auto-negotiation: Yes

        Supported FEC modes: Not reported

        Advertised link modes:  10000baseT/Full

                                1000baseX/Full

                                10000baseSR/Full

                                10000baseLR/Full

        Advertised pause frame use: No

        Advertised auto-negotiation: Yes

        Advertised FEC modes: Not reported

        Speed: Unknown!

        Duplex: Unknown! (255)

        Auto-negotiation: off <============

        Port: Other

        PHYAD: 0

        Transceiver: internal

        Supports Wake-on: g

        Wake-on: g

        Current message level: 0x00000007 (7)

                               drv probe link

        Link detected: no <============

Thank you in advance.
 
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