Power Management; Sleep Mode - Lenovo ThinkPad L13 Yoga Gen 4 Hardware Maintenance Manual

If no supervisor password has been set, do the following to remove the system management password:
1. Turn off the computer and disconnect ac power.
2. Disable the built-in battery. See "Disabling the built-in battery" on page 65.
3. Remove the base cover assembly. See "1020 Base cover assembly" on page 67.
4. Remove the built-in battery. See "1030 Built-in battery" on page 68.
5. Remove the coin-cell battery. See "1110 Coin-cell battery" on page 77.
6. Reinstall the coin-cell battery.
7. Reinstall the built-in battery.
8. Reinstall the base cover assembly.
9. Reconnect ac power.
10. Turn on the computer and wait until the POST ends. After the POST ends, the password prompt does
not appear. The system management password has been removed.
If a supervisor password has been set and is known to the service technician, do the following to remove the
system management password:
1. Turn on the computer.
2. When the ThinkPad logo is displayed, immediately press F1.
3. Type the supervisor password to enter the ThinkPad Setup program.
4. Select Security.
5. Select Password.
6. Select System Management Password.
7. Type the current supervisor password in the Enter Current Password field. Then leave the Enter New
Password field blank, and press Enter twice.
8. In the Changes have been saved window, press Enter.
9. Press F10 to save changes and exit the ThinkPad Setup program. The system management password
has been removed.

Power management

To reduce power consumption, the computer has two power management modes: sleep and hibernation.

Sleep mode

When the computer enters sleep mode, the screen goes blank and all internal devices are still powered on
with lower power consumption.
To enter sleep mode, press Fn+4 or open the Start menu.
In certain circumstances, the computer goes into sleep mode automatically:
• After a period of inactivity specified in power plan settings
• When the battery power is low
To resume the computer from sleep mode, press the power button.
Also, in either of the following events, the computer automatically returns from sleep mode and resumes
operation:
• The ring indicator (RI) is signaled by a serial device or a PC Card device.
• The time set on the resume timer elapses.
32
L13 Gen 4, L13 Yoga Gen 4, S2 Gen 8, and S2 Yoga Gen 8 Hardware Maintenance Manual