Disable powersaving for WiFi adaptors
This is how to disable power-saving mode for all WiFi adaptors. This tip will work for Ubuntu and Ubuntu derivatives. To disable power-saving, follow the steps below:
Open a terminal
type the following terminal command:
gksudo xed /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf
In the textfile that opens, look for the following lines:
[connection]
wifi.powersave = 3
Change the value of wifi.powersave from 3 into 2
Save the file and reboor your system