Lenovo ThinkPad X1 User Manual page 59

• UEFI PXE Boot Priority
Values: IPv4 First, IPv6 First
Description: Select network stack priority for UEFI PXE boot. This menu is displayed only in UEFI Only
boot mode or Both boot mode with UEFI first, when IPv6 and IPv4 stacks are both enabled.
• MAC Address Pass Through
Values: Disabled, Enabled
Description: Enable or disable the MAC Address Pass Through function when a dock is attached. If you
select Enabled, the dock Ethernet will use the same MAC address as the internal Ethernet LAN. If you
select Disabled, the dock Ethernet uses its own MAC address.
Keyboard/Mouse
• Enumerate Keyboard
Values: Off, On
Description: Enable or disable the USB keyboard in preboot environment if fast startup is enabled. If you
select Off, the USB keyboard will not work in preboot environment. If you select On, the USB Keyboard
works in preboot environment.
• On Screen Keyboard
Values: On, Off
Description: Enable or disable On Screen Keyboard in preboot environment. If you select Off, On Screen
Keyboard is disabled. If you select On, On Screen Keyboard is enabled.
• Tablet volume buttons are used for
Values: Audio volume control, Display brightness control
Description: If you select Audio volume control, the volume buttons are used to control the audio
volume. If you select Display brightness control, the volume buttons are used to control the display
brightness.
Display
• Boot Display Device
Values: ThinkPad LCD, External Display
Description: Select the display device that you want to activate at boot time. External Display refers to an
external display attached to the USB Type-C connector or HDMI connector on your ThinkPad computer. If
multiple displays are attached, the boot screen appears on the first recognized one.
• Total Graphics Memory
Values: 256 MB, 512 MB
Description: Allocate the total memory which Intel internal graphics shares.
Note: 512 MB is selectable only when Thunderbolt (TM) 3 Security Level is set to Display Port and USB.
• Boot Time Extension
Values: Disabled, 1 second, 2 seconds, 3 seconds, 5 seconds, 10 seconds
Description: During the boot process, the computer might not detect the external monitors that need more
time to get ready. Select how long you want to extend the boot process.
Power
• Power On with AC Attach
Values: Off, On
.
Chapter 5 Advanced configuration
45