Arch Linux

creep1ng_

Member

Registered: 2024-05-08

Posts: 1

Can't connect to Ethernet since a reboot.

Hi there. Since last Saturday I was unable to connect to Ethernet using my mobo network adapter. Then, I tryed doing thetering from my phone and this worked, until today. I've tryed several things in order to restablish my connection, since restarting NetworkManager, installing other kernels, and doing fresh install, and nothing seems useful.

There is systemctl status NetworkManager: https://pastebin.com/q081HEnt
Also, lspci -K: https://pastebin.com/j7dVCDTD
dsemg: https://pastebin.com/hF86Uns4

My mobo is Aorus b550m pro-p, with network adapter Realtek RTL8125. The logs I've uploaded are using linux-lts as kernel, but linux and linux-zen don't deliver very different results.

Thanks in advance for the collaboration, I'm somewhat new to this.

Last edited by creep1ng_ (2024-05-08 04:04:02)

seth

Member

Registered: 2012-09-03

Posts: 52,274

Re: Can't connect to Ethernet since a reboot.

[    9.919135] r8169 0000:03:00.0 eth0: RTL8125B, 18:c0:4d:8c:f7:26, XID 641, IRQ 73
[    9.919138] r8169 0000:03:00.0 eth0: jumbo features [frames: 9194 bytes, tx checksumming: ko]
[    9.937252] r8169 0000:03:00.0 enp3s0: renamed from eth0
[   10.467004] RTL8226B_RTL8221B 2.5Gbps PHY r8169-0-300:00: attached PHY driver (mii_bus:phy_addr=r8169-0-300:00, irq=MAC)
[   10.670637] r8169 0000:03:00.0 enp3s0: Link is Down
[   19.363639] RTL8226B_RTL8221B 2.5Gbps PHY r8169-0-300:00: Downshift occurred from negotiated speed 100Mbps to actual speed 10Mbps, check cabling!
[   19.363653] r8169 0000:03:00.0 enp3s0: Link is Up - 10Mbps/Full (downshifted) - flow control rx/tx

The NIC is picked up by the r8169 driver, brought up and then downshifts to 10Mbps

=> Check the cable. Plugs are part of the cable. On both sides. They need to be properly seated.
In doubt replace the cable.

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