NetworkManager WiFi Power Saving
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NetworkManager supports WiFi powersaving but the function is rather undocumented.

From the source code: wifi.powersave can have the following value:

  - NM_SETTING_WIRELESS_POWERSAVE_DEFAULT (0): use the default value
  - NM_SETTING_WIRELESS_POWERSAVE_IGNORE  (1): don't touch existing setting
  - NM_SETTING_WIRELESS_POWERSAVE_DISABLE (2): disable powersave
  - NM_SETTING_WIRELESS_POWERSAVE_ENABLE  (3): enable powersave

Then I propose 2 files, only one of them needs to be put under `/etc/NetworkManager/conf.d/`.  
One is forcing to disable powersaving, while the other one enable it.

Once you have put the file in the right folder, simply restart NetworkManager:

    sudo systemctl restart NetworkManager