The keyboard of Yoga 900 has a dedicated sixth row with Hotkey functions and Functions keys. By default, the hotkey functions are accessible by pressing the appropriate hotkey. The function keys are accessible by pressing the Fn key and the appropriate function key.
List of the Hotkey functions:
F1 - Mute/unmute the sounds
F2 - Decrease the volume level
F3 - Increase the volume level
F4 - Close the current active window
F5 - Refresh the desktop or the current active window
F6 - Enable/disable the touchpad
F7 - Enable/disable Airplane mode
F8 - Display all currently active apps
F9 - Turn on/off the backlight of the LCD screen
F10 - Toggle between the computer and external defice
F11 - Decrease display brightness
F12 - Increase display brightness
How to disable the HotKey Mode?
You can disable the hotkey mode in the BIOS Setup utility. To access BIOS Setup shutdown the Yoga 900, press the Novo button, and select BIOS Setup. In the BIOS Setup navigate to Configurations and set the HotKey Mode to Disabled. When the HotKey mode is disabled, press the Fn key and the appropriate function key to access the corresponding hotkeys. To access the function keys you do not need to press the Fn key when the hotkey mode is disabled.
Other function key combinations:
When you press and hold the Fn key and one of the other function keys you can enable or disable the following key combinations:
Fn & Space - Keyboard brightness (toggles between off, bright, or dim)