Create /etc/NetworkManager/dispatcher.d/pre-up.d/wlan_power with the following contents:

#!/bin/sh 

/sbin/iwconfig wlan0 power off


.

Add execute bit for the wlan_power script:

# chmod +x /etc/NetworkManager/dispatcher.d/pre-up.d/wlan_power

Restart NetworkManager & reconnect your WLAN interface or restart your computer.

# systemctl restart NetworkManager.service
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