Linux WiFi disable power mode

Check your current power save state:

cat /etc/NetworkManager/conf.d/*.conf

Unless it has been previously changed, it should read:

[connection]
wifi.powersave = 3

In this context, 3 indicates that the Network Manager will use power saving. Let’s change it to 2, indicating that the system will not use power saving. From the terminal:

sudo sed -i 's/3/2/' /etc/NetworkManager/conf.d/*
sudo systemctl restart NetworkManager.service