[Solved] Ethernet not working

Dishank · 2024-02-25 08:50:14

My ethernet was working fine till yesterday when I upgrade the NetworkManager package to latest. After the upgrade, it stopped working. I downgraded the package but the ethernet connection is still not working.

Till now, after downgrading the package, I tried several things like blacklisting the r8169 module and installing r8168 module. I also tried setting the kernel parameter iommu=soft. Then I tried changing the dhcp client to dhcpcd for network manager. This also did not help.

Everything was working fine till yesterday so apart from downgrading NetworkManager, I am not able to figure out what broke the system.

The ethernet connects to internet but then immediately disconnects because of "reason: carrier-changed".

Journal logs:

Feb 25 14:02:47 Enigma systemd-networkd[357]: enp2s0: Gained carrier
Feb 25 14:02:47 Enigma NetworkManager[3189]: <info>  [1708849967.7810] device (enp2s0): carrier: link connected
Feb 25 14:02:47 Enigma kernel: r8169 0000:02:00.0 enp2s0: Link is Up - 100Mbps/Full - flow control off
Feb 25 14:02:47 Enigma NetworkManager[3189]: <info>  [1708849967.7814] device (enp2s0): state change: unavailable -> disconnected (reason 'carrier-changed', sys-iface-state: 'managed')
Feb 25 14:02:48 Enigma systemd[1]: NetworkManager-dispatcher.service: Deactivated successfully.

Note that I am dual booting with Ubuntu and ethernet is working on it.

Last edited by Dishank (2024-02-26 17:34:15)

V1del · 2024-02-25 09:29:01

Did you restart NetworkManager after downgrading? There was an actual bug here, but it should be fixed in networkmanager 1.46.0-2 so you could update again

Dishank · 2024-02-25 10:18:13

Yeah I rebooted after downgrade. Just tried downgrading the kernel and headers. Tried lts kernel. Nothing changed.

seth · 2024-02-25 14:23:27

Please post your complete system journal for the boot:

sudo journalctl -b | curl -F 'file=@-' 0x0.st

But even from that tiny snippet you've NM and networkd enabled
=> Also post the output of

find /etc/systemd -type l -exec test -f {} \; -print | awk -F'/' '{ printf ("%-40s | %s\n", $(NF-0), $(NF-1)) }' | sort -f

Dishank · 2024-02-26 13:22:03

Journal logs: logs

Output from

find /etc/systemd -type l -exec test -f {} \; -print | awk -F'/' '{ printf ("%-40s | %s\n", $(NF-0), $(NF-1)) }' | sort -f

bluetooth.service                        | bluetooth.target.wants
dbus-org.bluez.service                   | system
dbus-org.freedesktop.network1.service    | system
dbus-org.freedesktop.nm-dispatcher.service | system
default.target                           | system
display-manager.service                  | system
getty@tty1.service                       | getty.target.wants
NetworkManager-wait-online.service       | network-online.target.wants
NetworkManager.service                   | multi-user.target.wants
p11-kit-server.socket                    | sockets.target.wants
pipewire-pulse.socket                    | sockets.target.wants
pipewire-session-manager.service         | user
pipewire.socket                          | sockets.target.wants
remote-fs.target                         | multi-user.target.wants
supergfxd.service                        | getty.target.wants
systemd-network-generator.service        | sysinit.target.wants
systemd-networkd-wait-online.service     | network-online.target.wants
systemd-networkd.service                 | multi-user.target.wants
systemd-networkd.socket                  | sockets.target.wants
wireplumber.service                      | pipewire.service.wants
xdg-user-dirs-update.service             | default.target.wants

seth · 2024-02-26 13:29:04

Disable the systemd-networkd stuff.

Feb 26 18:44:24 Enigma kernel: Generic FE-GE Realtek PHY r8169-0-200:00: attached PHY driver (mii_bus:phy_addr=r8169-0-200:00, irq=MAC)
Feb 26 18:44:24 Enigma kernel: r8169 0000:02:00.0 enp2s0: Link is Down
Feb 26 18:44:38 Enigma kernel: Generic FE-GE Realtek PHY r8169-0-200:00: Downshift occurred from negotiated speed 1Gbps to actual speed 100Mbps, check cabling!
Feb 26 18:44:38 Enigma kernel: r8169 0000:02:00.0 enp2s0: Link is Up - 100Mbps/Full (downshifted) - flow control off
Feb 26 18:44:43 Enigma kernel: r8169 0000:02:00.0 enp2s0: Link is Down
Feb 26 18:44:49 Enigma kernel: r8169 0000:02:00.0 enp2s0: Link is Down
Feb 26 18:44:57 Enigma kernel: Generic FE-GE Realtek PHY r8169-0-200:00: Downshift occurred from negotiated speed 1Gbps to actual speed 100Mbps, check cabling!
Feb 26 18:44:57 Enigma kernel: r8169 0000:02:00.0 enp2s0: Link is Up - 100Mbps/Full (downshifted) - flow control off
Feb 26 18:44:59 Enigma kernel: r8169 0000:02:00.0 enp2s0: Link is Down
Feb 26 18:45:05 Enigma kernel: r8169 0000:02:00.0 enp2s0: Link is Down
Feb 26 18:45:13 Enigma kernel: Generic FE-GE Realtek PHY r8169-0-200:00: Downshift occurred from negotiated speed 1Gbps to actual speed 100Mbps, check cabling!
Feb 26 18:45:13 Enigma kernel: r8169 0000:02:00.0 enp2s0: Link is Up - 100Mbps/Full (downshifted) - flow control off
Feb 26 18:45:16 Enigma kernel: r8169 0000:02:00.0 enp2s0: Link is Down
Feb 26 18:45:22 Enigma kernel: r8169 0000:02:00.0 enp2s0: Link is Down
Feb 26 18:45:30 Enigma kernel: Generic FE-GE Realtek PHY r8169-0-200:00: Downshift occurred from negotiated speed 1Gbps to actual speed 100Mbps, check cabling!
Feb 26 18:45:30 Enigma kernel: r8169 0000:02:00.0 enp2s0: Link is Up - 100Mbps/Full (downshifted) - flow control off

Cable. It's either undergraded, not properly plugged (on either and) or broken.

Dishank · 2024-02-26 15:45:40

I disabled systemd-network. Rebooted. It did not help.

Tried with another ethernet cable. That also did not help.

Also, my dual boot ubuntu has the ethernet working. So I expect arch to also work.

seth · 2024-02-26 15:49:50

It "works", it's just permanently losing the carrier.
And it's downshifting, what's yelling at you that your cable isn't up to the task.
Post a journal w/ the r8168 driver and w/o networkd.

Dishank · 2024-02-26 17:01:18

Ok, so it worked with a different ethernet cable. r8169 driver. Earlier when I had tested with different ethernet cable, I set the wrong IPv4 method. That's why it was not working. I set the IPv4 method to automatic and it worked.

seth · 2024-02-26 17:31:11

Please always remember to mark resolved threads by editing your initial posts subject - so others will know that there's no task left, but maybe a solution to find.
Thanks.

Arch Linux

#1 2024-02-25 08:50:14

[Solved] Ethernet not working

#2 2024-02-25 09:29:01

Re: [Solved] Ethernet not working

#3 2024-02-25 10:18:13

Re: [Solved] Ethernet not working

#4 2024-02-25 14:23:27

Re: [Solved] Ethernet not working

#5 2024-02-26 13:22:03

Re: [Solved] Ethernet not working

#6 2024-02-26 13:29:04

Re: [Solved] Ethernet not working

#7 2024-02-26 15:45:40

Re: [Solved] Ethernet not working

#8 2024-02-26 15:49:50

Re: [Solved] Ethernet not working

#9 2024-02-26 17:01:18

Re: [Solved] Ethernet not working

#10 2024-02-26 17:31:11

Re: [Solved] Ethernet not working

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