Latitude 3120/Latitude 3120 2-in-1 Service Manual

Power management

Table 1. Power managementThe table describes the performance options.
Option	Description
Lid Switch	Enable Lit Switch(enabled by default) — allows you to disable the lid switch so the screen does not shut off when the lid is closed. Power On Lid Open(enabled by default) — when enabled, this option allows the system to power up from the off state whenever the lid is opened. The system will power on when powered either by the AC adapter or by the system battery.
AC Behavior	Allows the system (if Off or in Hibernate) to power-on automatically, when AC is inserted. The Wake on AC option is disabled by default.
Enable Intel Speed Shift Technology	Allows you to enable.disable Intel Spped Shift Technology support. Setting this option to enable allows the operating system to select the appropriate processor performance automatically. The Enable Intel Speed Shift Technology option is enabled by default.
Auto On Time	Allows you to set the time at which the computer must turn on automatically. Disabled (enabled by default) Every Day Weekdays Select Days
USB Wake Support	Allows you to enable USB devices to wake the system from S3. NOTE This feature is only functional when the AC power adapter is connected. If the AC power adapter is removed during Standby, the system setup removes power from all the USB ports to conserve battery power. Wake on Dell USB-C Dock (enabled by default) — allows the system to automatically wake up when connecting to a Dell USB-C dock. Enable USB Wake Support (disabled by default)
Wireless Radio Control	If Enabled, this feature will sense the connection of the system to a wired network and subsequently disable the selected wireless radios (WLAN and/ or WWAN). Upon disconnection from the wired network, the selected wireless radios will be re-enabled. The Control WLAN radio option is disabled by default.
Wake on LAN	Allows you to enable or disable the feature that powers on the computer from the Off state when triggered by a LAN signal or special Dell USB-C Dock LAN signal. Wakeup from the standby state is unaffected by this setting and must be enabled in the operating system. This feature only works when the computer is connected to AC. Disabled (enabled by default) LAN Only LAN with PXE Boot
Block Sleep	This option allows you to block entering to sleep in OS environment. When enabled system won't go to sleep, Intel Rapid Start will be disabled automatically and OS Power option will be blank if it was set to sleep. The Block Sleep option is disabled by default.
Peak Shift	This option enables you to minimize the AC power consumption at the times of peak demand. When enabled with user set daily times and threshold value: from Peak Shift Start until Peak Shift End, AC power is not used unless Battery Threshold is reached. from Peak Shift End until Peak Shift Charge Start, AC power is used when available but the battery does not charge. At all other times, AC power is used when available and the batter is able to charge. The Enable Peak Shift option is disabled by default. The battery threshold (15% to 100%) is set to 15% by default.
Advanced Battery Charge Configuration	This option enables you to maximize the battery health while supporting heavy use during the work day. The following takes place using the user set daily times and time periods: from Beginning of Day and lasting for Work Period, ExpressCharge is used for accelerated battery charging. At all other times Standard Charge is used for maximum battery health. Setting Work Period to zero disables this feature for that day. The Enable Advanced Battery Charge Mode option is disabled by default.
Primary Battery Charge Configuration	Allows you to select the charging mode for the battery. The options are: Adaptive (enabled by default) — battery settings are adaptively optimized based on your typical battery usage patter. Standard (disabled by default) — fully charges your battery at a standard rate. ExpressCharge (disabled by default) — the battery charges over a shorter time using Dell’s fast charging technology. Primarily AC use (disabled by default) — Extends battery lifespan for users who primarily operate their system while plugged into an external power source. Custom (disabled by default) — Custom select when battery starts and stops charging The Custom Charge Start is set at 50 by default. The Custom Charge Stop is set at 90 by default. NOTE Battery settings may not be available for all battery types. In order to enable this option, Advanced Battery Charge Mode must be disabled.