Lenovo 59RF0172 ユーザーズマニュアル

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Chapter 2. Learning the basics
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Using passwords
Using passwords helps prevent your computer from being used by others. 
Once you set a password and enable it, a prompt appears on the screen each 
time you power on the computer. Enter your password at the prompt. The 
computer cannot be used unless you enter the correct password.
For details about how to set the password, see the Help to the right of the 
screen in the BIOS setup utility.
Using Switchable Graphics (specific models only) 
- - - - - - - - - - - - - - 
Some IdeaPad models support Switchable Graphics. The system will 
automatically choose and switch over to the integrated or dedicated GPU 
according to the current loading.
Note: This password can be from one to seven alphanumeric characters in any combination.
Note: To enter BIOS setup utility, press F2 when the Lenovo logo appears on the screen while 
the computer is starting up.