LCD power options change when AC adapter disconnected
It was noticed by a system user that when the AC adapter was disconnected from their Dell portable system (in this case XPS 12 systems), the power management setting for turn off the display under On Battery would change to 3 minutes. This would happen regardless of what the setting was selected previously. No other settings would change when the AC adapter was removed from the system.
Issue is a function of Dell Extended Battery Life options
Investigation using several systems isolated the cause to a function of the Dell Extended Battery Life options setup in the systems. One of the default functions of the Dell Extended Battery Life options will automatically set the LCD to turn off after 3 minutes of no use while on battery power. This option was making the observed change and was worked per the design of the application.
If you desire to change this setting, then open Power Options, click entry for Dell Extended Battery Life Options. Change the settings highlighted to stop this behavior.
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