View Uefi Bios Event Logs - Lenovo ThinkPad X1 Carbon Gen 12 User Manual

Note: No bootable device is displayed if the computer cannot start from any devices or the operating
system cannot be found.
3. Set the startup sequence as desired.
4. Press F10 to save the changes and exit.
To change the startup sequence temporarily:
1. Restart the computer. When the logo screen is displayed, press F12.
2. Select the device that you want the computer to start from and press Enter.

View UEFI BIOS Event logs

The UEFI BIOS Event log viewer provides the brief information about UEFI BIOS events. Do the following to
view the logs:
1. Restart the computer. When the logo screen is displayed, press F1.
2. Select Main ➙ BIOS Event log. Then, press Enter. The UEFI BIOS Event log interface is displayed.
3. Navigate the interface by pressing the following keys, and then check details by selecting each item.
• ↑↓: Move keyboard focus
• PgUp / PgDn: Scroll page
• Enter: Select
• F3: Exit
The following UEFI BIOS event logs might be listed on your screen depending on UEFI BIOS activities. Each
log consists of a date, a time, and a description of the event.
• Power On event: This log shows the Power On Self Test (POST) routine has started with the power-on
process. It includes the power-on reason, the boot mode, and the shutdown reason.
• Subcomponent Code Measurement event: This log shows the subcomponent code measurement has
worked. It includes the validation result of each component.
• System Preboot Authentication event: This log shows what credential is provided to gain preboot
authentication. It includes the installed password, the password type, the input device, and the
authentication result.
• BIOS Password Change event: This log shows the change history of the UEFI BIOS passwords. It
includes the password type, the type and result of the event.
• Subcomponent Self-healing event: This log shows the information about the subcomponent where the
recovery event occurred. It includes the cause and result of the event, and the recovered firmware version.
• BIOS Setup Configuration Change event: This log shows the change history of the UEFI BIOS Setup
configuration. It includes the item name and value.
• Device Change event: This log shows the change history of devices. It includes the cause and type of the
event.
• System Boot event: This log shows which device was utilized to boot the system. It includes the boot
option, the description, and the file path list.
• System Tamper event: This log shows the occurrence of system tamper events. It includes the cause and
type of the event.
• POST Error event: This log shows the occurrence of errors during the POST routine. It includes the error
code.
• Flash Update event: This log shows the occurrence of flash update. It includes the cause and result of the
event, and the updated firmware version.
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ThinkPad X1 Carbon Gen 12 User Guide