Lenovo 428742U, X220I TABLET, X220 TABLET Menu item Submenu item Selection Comments Display

Table 6. Config menu items (continued)

Menu item	Submenu item	Selection		Comments
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,
		•	Digital 1 on dock	password prompt, and
		• Digital 2 on dock		ThinkPad Setup.
				“Digital on Thinkpad”
				is DisplayPort on your
				computer.
				“Digial 1 on dock” and
				“Digital 2 on dock” are
				DisplayPort or DVI on
				docking station.
	Graphics Device	•	Integrated Graphics	Integrated Graphics will
		•	Discrete Graphics	achieve longer battery life,
				and Discrete Graphics
		•	NVIDIA Optimus
				enhances performance.
				NVIDIA Optimus runs as
				Integrated Graphics mode
				and Discrete Graphics is
				enabled on demand.
				Note: NVIDIA Optimus
				mode should only be
				selected if you are using a
				Windows 7 model.
	OS Detection for NVIDIA	•	Disabled	System BIOS automatically
	Optimus	•	Enabled	switches Graphics device
				setting to NVIDIA Optimus
				mode if the OS supports
				the feature, and to Discrete
				Graphics if the OS does not
				support it.
Power	Intel SpeedStep®	•	Disabled	Select the mode of Intel
	technology (Intel	•	Enabled	SpeedStep technology at
	SpeedStep mounted			runtime.
	models only)	Mode for AC		Maximum Performance:
		•	Maximum Performance
				Always highest speed
		•	Battery Optimized	Battery Optimized: Always
		Mode for Battery		lowest speed
		•	Maximum Performance	Disabled: No runtime
		•	Battery Optimized	support, lowest speed

Chapter 8. Advanced configuration 189