Ethernet fails to connect without cable and freezes DE

General system
1

Hello,

this is my first post, so if this is not the right place, i will move it.

I have a strange issue with my new (to me) laptop, a Thinkpad T495, i need troubleshooting.

At random times, i will get a notification saying that the ethernet failed to connect and the DE will freeze for a few seconds. I usually do not have an ethernet cable connected at those times, but as far as i could tell, it can happen with a cable plugged in.

From this point on, this happens constantly until i reboot the computer. I could not find a way to reproduce the issue and find what causes it. The TLP configuration is the default. I also had this issue with TLP disabled. I also tried both kernel modules ( r8169 & r8168) after the suggestion at the following page and i saw no change.

Since this is a new laptop, i first installed Endeavour with KDE, i encountered this issue which i thought it was an issue with KDE so i did a clean install again with Gnome. I now have the same issue.

Can you please help me find what is going on?

Edit: Maybe the following is relevant. Output of hwinfo --netcard --short

network:                                                        
  enp3s0f0             Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
  wlan0                Intel Wireless-AC 9260
  enp4s0               Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller

Edit 2: My system

System:    Kernel: 5.14.5-arch1-1 x86_64 bits: 64 compiler: gcc v: 11.1.0 Desktop: GNOME 40.4 tk: GTK 3.24.30 wm: gnome-shell 
           dm: GDM Distro: EndeavourOS base: Arch Linux 
Machine:   Type: Laptop System: LENOVO product: 20NKS28C02 v: ThinkPad T495 serial: <filter> Chassis: type: 10 
           serial: <filter> 
           Mobo: LENOVO model: 20NKS28C02 serial: <filter> UEFI: LENOVO v: R12ET57W(1.27 ) date: 11/24/2020 
Battery:   ID-1: BAT0 charge: 49.5 Wh (96.1%) condition: 51.5/50.5 Wh (101.9%) volts: 12.8 min: 11.6 model: LGC 5B10W139 
           serial: <filter> status: Discharging 
CPU:       Info: Quad Core model: AMD Ryzen 7 PRO 3700U w/ Radeon Vega Mobile Gfx bits: 64 type: MT MCP arch: Zen rev: 1 
           cache: L2: 2 MiB 
           flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm bogomips: 36750 
           Speed: 1222 MHz min/max: 1400/2300 MHz boost: enabled Core speeds (MHz): 1: 1222 2: 1223 3: 1387 4: 1586 5: 1896 
           6: 1492 7: 1373 8: 1392 
Graphics:  Device-1: Advanced Micro Devices [AMD/ATI] Picasso vendor: Lenovo driver: amdgpu v: kernel bus-ID: 06:00.0 
           chip-ID: 1002:15d8 
           Device-2: IMC Networks Integrated Camera type: USB driver: uvcvideo bus-ID: 4-2.1:4 chip-ID: 13d3:56a6 
           Display: wayland server: X.org 1.20.13 compositor: gnome-shell driver: loaded: amdgpu 
           note: n/a (using device driver) - try sudo/root resolution: <missing: xdpyinfo> 
           Message: Unable to show advanced data. Required tool glxinfo missing. 
Audio:     Device-1: Advanced Micro Devices [AMD/ATI] Raven/Raven2/Fenghuang HDMI/DP Audio vendor: Lenovo 
           driver: snd_hda_intel v: kernel bus-ID: 06:00.1 chip-ID: 1002:15de 
           Device-2: Advanced Micro Devices [AMD] Raven/Raven2/FireFlight/Renoir Audio Processor vendor: Lenovo 
           driver: snd_pci_acp3x v: kernel bus-ID: 06:00.5 chip-ID: 1022:15e2 
           Device-3: Advanced Micro Devices [AMD] Family 17h HD Audio vendor: Lenovo driver: snd_hda_intel v: kernel 
           bus-ID: 06:00.6 chip-ID: 1022:15e3 
           Sound Server-1: ALSA v: k5.14.5-arch1-1 running: yes 
           Sound Server-2: JACK v: 1.9.19 running: no 
           Sound Server-3: PulseAudio v: 15.0 running: yes 
           Sound Server-4: PipeWire v: 0.3.35 running: no 
Network:   Device-1: Intel Wireless-AC 9260 driver: iwlwifi v: kernel bus-ID: 01:00.0 chip-ID: 8086:2526 
           IF: wlan0 state: up mac: <filter> 
           Device-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: Lenovo driver: r8168 v: 8.049.02-NAPI 
           port: 3400 bus-ID: 03:00.0 chip-ID: 10ec:8168 
           IF: enp3s0f0 state: down mac: <filter> 
           Device-3: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: Lenovo driver: r8168 v: 8.049.02-NAPI 
           port: 2000 bus-ID: 04:00.0 chip-ID: 10ec:8168 
           IF: enp4s0 state: down mac: <filter> 
Drives:    Local Storage: total: 476.94 GiB used: 79.08 GiB (16.6%) 
           ID-1: /dev/nvme0n1 vendor: Toshiba model: N/A size: 476.94 GiB speed: 31.6 Gb/s lanes: 4 serial: <filter> 
Partition: ID-1: / size: 461.54 GiB used: 79.08 GiB (17.1%) fs: btrfs dev: /dev/nvme0n1p2 
           ID-2: /boot/efi size: 511 MiB used: 576 KiB (0.1%) fs: vfat dev: /dev/nvme0n1p1 
           ID-3: /home size: 461.54 GiB used: 79.08 GiB (17.1%) fs: btrfs dev: /dev/nvme0n1p2 
           ID-4: /var/log size: 461.54 GiB used: 79.08 GiB (17.1%) fs: btrfs dev: /dev/nvme0n1p2 
Swap:      ID-1: swap-1 type: partition size: 14.89 GiB used: 0 KiB (0.0%) priority: -2 dev: /dev/nvme0n1p3 
Sensors:   System Temperatures: cpu: 49.9 C mobo: N/A gpu: amdgpu temp: 49.0 C 
           Fan Speeds (RPM): fan-1: 0 
Info:      Processes: 296 Uptime: 50m Memory: 13.54 GiB used: 2.85 GiB (21.1%) Init: systemd v: 249 Compilers: gcc: 11.1.0 
           clang: 12.0.1 Packages: pacman: 1032 Shell: Bash v: 5.1.8 running-in: gjs inxi: 3.3.05

Edit 3: Just happened again. Partial output of journalctl --since “10 minutes ago”

-- Journal begins at Sun 2021-09-12 21:34:05 EEST, ends at Sat 2021-09-18 17:41:22 EEST. --
Σεπ 18 17:38:41 evripidis-thinkpad kernel: enp4s0: pci_sn_h = 0xffffffff, should be 0x01000000 
                                              .
Σεπ 18 17:38:41 evripidis-thinkpad kernel: enp4s0: esd_flag = 0x4000
                                              .
Σεπ 18 17:38:41 evripidis-thinkpad kernel: r8168: enp4s0: link up
Σεπ 18 17:38:41 evripidis-thinkpad NetworkManager[453]: <info>  [1631975921.3805] device (enp4s0): carrier: link connected
Σεπ 18 17:38:41 evripidis-thinkpad NetworkManager[453]: <info>  [1631975921.3807] device (enp4s0): state change: unavailable -> disconnected (reason 'carrier-changed', sys-iface-state: 'man>
Σεπ 18 17:38:41 evripidis-thinkpad kernel: IPv6: ADDRCONF(NETDEV_CHANGE): enp4s0: link becomes ready
Σεπ 18 17:38:48 evripidis-thinkpad kernel: enp4s0: cmd = 0xff, should be 0x07 
                                              .
Σεπ 18 17:38:48 evripidis-thinkpad kernel: enp4s0: io_base_l = 0xffff, should be 0x2001 
                                              .
Σεπ 18 17:38:48 evripidis-thinkpad kernel: enp4s0: mem_base_l = 0xffff, should be 0x4004 
                                              .
Σεπ 18 17:38:48 evripidis-thinkpad kernel: enp4s0: mem_base_h = 0xffff, should be 0xd070 
                                              .
Σεπ 18 17:38:48 evripidis-thinkpad kernel: enp4s0: resv_0x1c_l = 0xffff, should be 0x0000 
                                              .
Σεπ 18 17:38:48 evripidis-thinkpad kernel: enp4s0: resv_0x1c_h = 0xffff, should be 0x0000 
                                              .
Σεπ 18 17:38:48 evripidis-thinkpad kernel: enp4s0: resv_0x20_l = 0xffff, should be 0x0004 
                                              .
Σεπ 18 17:38:48 evripidis-thinkpad kernel: enp4s0: resv_0x20_h = 0xffff, should be 0xd070
2

Does your system work on the r8169 kernel module? The r8168 is an installed package. If you have wifi i would remove the r8168 and reboot and see if it works on the r8169 and whether you have that issue still.

3

I also see two Ethernet? Do you have two ports?

Edit:

Device-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: Lenovo driver: r8168 v: 8.049.02-NAPI 
           port: 3400 bus-ID: 03:00.0 chip-ID: 10ec:8168 
           IF: enp3s0f0 state: down mac: <filter> 
           Device-3: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: Lenovo driver: r8168 v: 8.049.02-NAPI 
           port: 2000 bus-ID: 04:00.0 chip-ID: 10ec:8168
4

It is a laptop, so i have wifi. I tried to do this, following the steps in the link page (i guess this is what you mean). It did not make any difference. Is it possible it may be fixed with a BIOS update?

I do not have two ports. It looks weird to me too. Is it possible for one of them to be because of the USB Type-C port or the one next to it (see https://www.notebookcheck.net/fileadmin/_processed_/5/8/csm_DSC_0036_38b52a5c92.jpg)?

5

Try to remove the r8168 module.

sudo pacman -R r8168 and reboot

Edit: Sorry i had a typo

6

OK, i will do it and report back with my findings.

7

I did it and so far i do not see any change. I still see two ethernet. It may take a few minutes or even hours before the issue happens again. So, i guess i should wait to see if it happens again,

8

I’m not sure why two ethernet ports are showing? I do see it listing ipv6 listed in the log. Maybe disable ipv6? Check router settings maybe?

9

I disabled ipv6 for enp4s0. Let’s see if this works. Thank you very much for the help. I will post here again if the issue happens again. If not i will mark it as solved.

1 Like
10

So far so good. It is probably resolved. Thank you. The solution was to disable ipv6 or deleting r8168 or both of them at the same time.

1 Like
11

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