Lenovo ThinkPad S1 Yoga User Manual page 106

Table 7. Startup menu items
Menu item
Boot
UEFI/Legacy Boot
Boot Mode
Option Key Display
Boot Device List F12 Option
Boot Order Lock
90
User Guide
Selection
• Both
• UEFI Only
• Legacy Only
UEFI/Legacy Boot Priority
• Legacy First
• UEFI First
CSM Support
• No
• Yes
• Quick
• Diagnostics
• Enabled
• Disabled
• Enabled
• Disabled
• Disabled
• Enabled
Comments
Select the boot device when you
press the power button to turn on the
computer.
Select system boot capability.
• Both: The system boots by the
following UEFI/Legacy Boot Priority
setting.
• UEFI Only: The system boots from
the UEFI enabled operating system.
• Legacy Only: The system boots from
any operating system other than the
UEFI enabled one.
Note: If you select UEFI Only, the
system cannot boot from the bootable
devices that do not have the UEFI
enabled operating system.
Compatibility Support Module (CSM) is
required for booting the legacy operating
system. If you select UEFI Only, CSM
Support will be selectable. For Both or
Legacy Only mood, CSM Support will
not be selectable.
Note: The Both and the CSM Support
selections are available when theOS
Optimized Defaults on the Restart
menu is set as Disabled, the UEFI
Only selection is available when theOS
Optimized Defaults on the Restart
menu is set as Enabled.
Quick: The diagnostic splash screen will
not be displayed unless you press Esc
during starting the system.
Diagnostics: The diagnostic splash
screen is always displayed during
starting the system.
Choose whether to show the option key
message when the system is started.
If you select Enabled, a pop-up boot
device List will be displayed when you
press F12 key.
Note: Only the person who knows the
supervisor password can change the
setting of this option.
If you select Disabled, your computer
will boot using the default priority. If you
select Enabled, your computer will boot
using the priority you have customized.