Fix slow ethernet adapter speed on Linux

README.md

Fix slow ethernet adapter speed on Linux

Tested for:

• Ubuntu 18.04/20.04
• Lenovo X1 Carbon 6th gen ethernet dongle

1. Download check-eth.sh to a directory on your $PATH, e.g. ~/.local/bin
2. Make it executable with chmod +x ~/.local/bin/check-eth.sh
3. Download check-eth.desktop to ~/.local/share/applications
4. The script can be run both from the command line, or from the Gnome application launcher by entering "Check ethernet"

check-eth.desktop

[Desktop Entry]
Name=Check ethernet speed and reload driver
Exec=gnome-terminal -e "check-eth.sh"
Terminal=false
Type=Application
Categories=Utility;Network

check-eth.sh

#!/bin/bash

set -euo pipefail

LAN_INTERFACE_NAME="enp0s31f6"
KERNEL_DRIVER_NAME="e1000e"

function check-eth-interface-speed {
    local _interface="$LAN_INTERFACE_NAME"
    echo "Checking speed for interface \"$_interface\"..."
    sudo ethtool "$_interface" | grep -i Speed
} 

function reload-kernel-driver {
    local _modname="$KERNEL_DRIVER_NAME"
    echo "Reloading kernel driver $_modname"
    sudo modprobe --remove --verbose "$_modname"
    sleep 2
    sudo modprobe --verbose "$_modname"
}

function at-end {
    read -n1 -rsp $'Press any key to continue or Ctrl+C to exit...\n'
}

function main {
    check-eth-interface-speed
    reload-kernel-driver
    sleep 5
    check-eth-interface-speed
    at-end
}

main