Lenovo E420, E520, 114155U manual Menu item Submenu item Selection Comments

Table 4. Config menu items (continued)

Menu item	Submenu item	Selection		Comments
	Change to “F1–F12 keys”	•	Default	If you select “Default”,
		•	Legacy	pressing F1–F12 initiates
				special functions illustrated
				on each key. If you
				select “Legacy”, you can
				use F1–F12 as standard
				function keys.
Display	Boot Display Device	•	ThinkPad LCD	Select the display device
		•	Analog (VGA)	that is to be active at boot
				time. This selection is
		•	Digital on ThinkPad
				effective for boot time,
				password prompt, and
				ThinkPad Setup.
	Graphics Device	•	Integrated Graphics	Integrated Graphics
		•	Switchable Graphics	provides longer battery life,
				and Switchable Graphics
				enhances performance.
	OS Detection for	•	Disabled	If you select “Enabled,” the
	Switchable Graphics	•	Enabled	system UEFI automatically
				switches the graphics
				device setting to Switchable
				Graphics mode if the
				operating system supports
				this feature, and to
				Integrated Graphics mode if
				the operating system does
				not support this feature.
Power	Intel SpeedStep®	•	Disabled	Select the mode of Intel
	technology (Intel	•	Enabled	SpeedStep technology in
	SpeedStep mounted			the user UEFI at runtime.
	models only)	Mode for AC
		•	Maximum Performance
		•	Battery Optimized
		Mode for Battery
		•	Maximum Performance
		•	Battery Optimized
	Optical Drive Speed	•	High Performance	Set the Optical Drive
		•	Normal	Speed.
		•	Silent
	CPU Power Management	•	Disabled	Unless this power-saving
		•	Enabled	feature is disabled, it
				stops the processor clock
				automatically when there
				is no system activity. You
				usually don't need to
				change this function.
	PCI Express Power	•	Disabled	Enables or disables a
	management	•	Enabled	feature that automatically
				adjusts power management
				when there is no PCI

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