I happen to be a long-time user of this app, which exports shortcuts to the Android system, which together with this app, allow for the automation of power-saving mode, by way of NFC Tags.
Until recently, this phone still had Android 5.0.2 (Lollipop) on it, which meant that the power-saving app was able to toggle power-saving mode without requiring special permissions. However, since my upgrade to Android 6.0.1 on the phone (Marshmallow), this permission is no longer granted. And so I needed to grant access to the power-saving app, to restricted settings on the phone, via ADB USB Debugging.
Today was the first time I ever used the ADB Drivers on my Linux laptop named ‘Klystron’.