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P1L PCIe Ethernet adapter

The P1L 2.5Gbps PCIe Ethernet Network Interface Card works out of the box in all Linux distributions that have at least kernel 5.9, which was released in Oct 2020, or any later kernel. This includes for example Ubuntu 20.04+, Debian 11+, Fedora 33+ and all recent distributions.

Additionally, it works out of the box in the following distributions, even though they have kernels older than 5.9; that’s because these distributions have backported the necessary r8169 driver:

  • CentOS Linux 8 with kernel 4.18.0-348.7.1.el8_5.x86_64
  • CentOS Stream 8 with kernel 4.18.0-483.el8.x86_64
  • OpenSUSE Leap 15.3 with kernel 5.3.18-150300.59.106
  • RHEL 8.3 with kernel 4.18.0-240.22.1.el8_3.x86_64

💡 Tip: To see if your distribution supports this adapter out of the box, run the following command; if the output is non-empty, it supports it:

# grep 10EC.*8125 /lib/modules/*/modules.alias
/lib/modules/5.15.0-69-generic/modules.alias:alias pci:v000010ECd00008125sv*sd*bc*sc*i* r8169
...

The following paragraphs describe how to install a newer kernel in some older distributions that do not have a 5.9+ kernel.

Ubuntu 20.04 Focal Fossa

Ubuntu 20.04 Focal Fossa may have either the 5.4 kernel, or the 5.15 kernel, depending on which installation media you used. To install the 5.15 kernel, run the following command and reboot:

sudo apt install linux-generic-hwe-20.04

Debian 10 Buster

Debian Buster normally comes with the 4.19 kernel. To install the 5.10 kernel, run the following command and reboot:

sudo apt install linux-image-5.10-$(dpkg --print-architecture)

DKMS package

In older distributions that don’t have a 5.9+ kernel, it’s possible to compile the driver locally. The following github page provides the driver in various forms, for example via Launchpad PPA, Debian package, DKMS package, or source code compilation:

https://github.com/awesometic/realtek-r8125-dkms

Technical information

The PCI ID and the driver in use can be shown using the following command:

# lspci -nn -k | grep -A 3 Ethernet
05:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8125 2.5GbE Controller [10ec:8125] (rev 04)
    Subsystem: Realtek Semiconductor Co., Ltd. RTL8125 2.5GbE Controller [10ec:8125]
    Kernel driver in use: r8169
    Kernel modules: r8169