Fix Intel I225-V ethernet link after suspend

Based on info found in:

https://wiki.archlinux.org/title/Power_management#Hooks_in_.2Fusr.2Flib.2Fsystemd.2Fsystem-sleep

For Arch, create a script in this folder:

sudo nano /usr/lib/systemd/system-sleep/network_fix.sh

In Ubuntu you should need to place the script in /lib/systemd/system-sleep/ (I didn’t test this).

Place this into the script:

#!/bin/sh
case $1/$2 in
  pre/*)
    echo "Going to $2... Yolooo"
    ;;
  post/*)
    echo "Waking up from $2... Yolooo"
    sleep 10 && ip link set dev eno1 down && ip link set dev eno1 up
    ;;
esac

Adapt the code to your network interface name (in this example it is called eno1).

Make the script executable:

sudo chmod a+x /usr/lib/systemd/system-sleep/network_fix.sh

Reboot then put the system on sleep. After waking it up you can check the log with:

journalctl -b -u systemd-suspend.service