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Ethernet not working on Thinkpad T14 AMD with Manjaro and Kernel 5.8

So far, everything works out of the box on my ThinkPad T14 AMD with Manjaro 20.2 and Linux kernel 5.8 — except for the ethernet adapter. The T14 comes with a RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller and by default the r8169 kernel module is used. However, after plugging in a wired connection, nothing happened. Not even a blinking led.

To resolve this issue, we need to get the kernel module for Realtek 8168 network cards:

pacman -S linux58-r8168

Also, we need to blacklist the r8169 module:

echo "blacklist r8169" > /etc/modprobe.d/r8169_blacklist.conf

After unloading the old module and loading the new one (rmod r8169 and modprobe r8168 or just rebooting) your wired connection should work flawlessly.