Cannot increase the speed above 100Mbps

[Incantatoric]

Hi, so I followed the instruction and successfully installed the driver on my Ubuntu machine, but I cannot increase the speed. If I use ethtool to force increasing the speed, it just disconnects or sometimes gives me an error message that it is an invalid command. I am dual booting on Windows on a separate drive and there I get higher speed. Below is the information:

Kernel Version

uname -r
6.8.0-47-generic

Installed Kernels

dpkg --list | grep linux-image
ii linux-image-6.8.0-47-generic 6.8.0-47.47 amd64 Signed kernel image generic
ii linux-image-generic-hwe-24.04 6.8.0-47.47 amd64 Generic Linux kernel image

Driver in Use

lspci -k | grep -A 3 Ethernet
0e:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8125 2.5GbE Controller (rev 05)
Subsystem: ASRock Incorporation RTL8125 2.5GbE Controller
Kernel driver in use: r8125
Kernel modules: r8169, r8125

Network Device Info

sudo lshw -C network
*-network
description: Ethernet interface
product: RTL8125 2.5GbE Controller
vendor: Realtek Semiconductor Co., Ltd.
logical name: enp14s0
size: 100Mbit/s
capacity: 1Gbit/s
driver: r8125
driverversion: 9.013.02-NAPI
speed: 100Mbit/s

ethtool Output

sudo ethtool enp14s0
Speed: 100Mb/s
Duplex: Full
Auto-negotiation: on

Check Loaded Modules

lsmod | grep r8125
r8125 286720 0

dmesg Output (Errors/Warnings)

sudo dmesg | grep r8125
[ 4.004697] r8125: loading out-of-tree module taints kernel.
[ 4.004706] r8125: module verification failed: signature and/or required key missing - tainting kernel
[ 4.093760] r8125 0000:0e:00.0 enp14s0: renamed from eth0
[ 270.914457] r8125 0000:0e:00.0 enp14s0: Transmit timeout reset Device!
[ 270.919438] r8125 0000:0e:00.0 enp14s0: Device reseting!

Attempt to Set 1000 Mbps (Error message or disconnection)

sudo ethtool -s enp14s0 speed 1000 duplex full autoneg on

Network Manager Logs

journalctl -u NetworkManager

Network Interface Info

ip link show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
3: enp14s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000

I have no idea why this is causing an error. I have tried everything that I could try. I even bought a usb-ethernet adapter but it did not change anything. If needed, I can buy an intel-based network card but I am not even sure if that will fix the issue... I will provide with you any detail that is necessary. Thank you in advance.

[awesometic]

Hello,

It seems like the r8125 module is not loaded properly. How did you install the package? Using the deb file or PPA?

[Incantatoric]

Hello,

It seems like the r8125 module is not loaded properly. How did you install the package? Using the deb file or PPA?

Hi, thank you for your reply! I think I did it with deb. Should I uninstall it and then try with PPA?

[awesometic]

Installing it with the deb file should work.

Uninstall it and reinstall the deb, or PPA if you want to, and please check this contents after installation.
https://github.com/awesometic/realtek-r8125-dkms?tab=readme-ov-file#verify-the-module-is-loaded-successfully

If still it doesn't work, please let me know.

[Incantatoric]

Installing it with the deb file should work.

Uninstall it and reinstall the deb, or PPA if you want to, and please check this contents after installation. https://github.com/awesometic/realtek-r8125-dkms?tab=readme-ov-file#verify-the-module-is-loaded-successfully

If still it doesn't work, please let me know.

Hi, I tried with the latest .deb file but the result is almost the same. This latest version had no error message when installing unlike the previous one, but the symptoms are almost the same:

sudo lshw -C network

*-network
description: Ethernet interface
product: RTL8125 2.5GbE Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:0e:00.0
logical name: enp14s0
version: 05
serial: 9c:6b:00:63:b7:4f
size: 100Mbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8125 driverversion=9.014.01-NAPI duplex=full ip=192.168.45.77 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
resources: irq:38 ioport:e000(size=256) memory:f6a00000-f6a0ffff memory:f6a10000-f6a13fff

sudo ethtool enp14s0

Settings for enp14s0:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
2500baseT/Full
Supported pause frame use: Symmetric Receive-only
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
Link partner advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Link partner advertised pause frame use: Transmit-only
Link partner advertised auto-negotiation: Yes
Link partner advertised FEC modes: Not reported
Speed: 100Mb/s
Duplex: Full
Auto-negotiation: on
Port: Twisted Pair
PHYAD: 0
Transceiver: internal
MDI-X: on
Supports Wake-on: pumbg
Wake-on: g
Current message level: 0x00000033 (51)
drv probe ifdown ifup
Link detected: yes

lsmod | grep r8125

r8125 303104 0

lsmod | grep r8169

sudo dmesg | grep r8125

[ 4.872519] r8125: loading out-of-tree module taints kernel.
[ 4.872530] r8125: module verification failed: signature and/or required key missing - tainting kernel
[ 4.874632] r8125 Ethernet controller driver 9.014.01-NAPI loaded
[ 5.264612] r8125: This product is covered by one or more of the following patents: US6,570,884, US6,115,776, and US6,327,625.
[ 5.266635] r8125 Copyright (C) 2024 Realtek NIC software team [email protected]
[ 5.980030] r8125 0000:0e:00.0 enp14s0: renamed from eth0
[ 21.235359] r8125: enp14s0: link up
[ 110.718667] r8125: enp14s0: link down
[ 124.037049] r8125: enp14s0: link up
[ 328.916948] r8125: enp14s0: link down
[ 328.927715] workqueue: rtl8125_linkchg_task [r8125] hogged CPU for >10000us 4 times, consider switching to WQ_UNBOUND
[ 342.185667] r8125: enp14s0: link up
[ 406.382325] r8125: enp14s0: link down
[ 419.732876] r8125: enp14s0: link up
[ 419.749336] workqueue: rtl8125_linkchg_task [r8125] hogged CPU for >10000us 8 times, consider switching to WQ_UNBOUND
[ 419.754211] r8125: enp14s0: link down
[ 433.025386] r8125: enp14s0: link up
[ 433.046774] r8125: enp14s0: link down
[ 448.986398] r8125: enp14s0: link up
[ 449.007658] r8125: enp14s0: link down
[ 462.215256] r8125: enp14s0: link up

I tried setting the change 1000 and it is now appropriately shown at system settings network, but no matter what I try with link negotiation and manual speed, I am stuck at 100MB...