Fn key combinations
The following table shows the function of each combination
of Fn with a function key.
The Fn key works independently from the operating
system.
Key
combination
Description
Fn + F1 Reserved.
Fn + F2 Reserved.
Fn + F3 Turn off the LCD display, leaving the screen
blank. To turn the LCD display on again, press
any key or the TrackPoint stick.
Fn + F4 Turn standby mode on. To return to normal
operation, press the Fn key independently,
without pressing a function key.
Fn + F5 Reserved.
Fn + F6 Reserved.
Fn + F7 Switch between the LCD and an external
monitor (CRT). If an external monitor is
attached, computer output is displayed in the
following three patterns by turns:
v CRT display
v LCD + CRT display
v LCD
Fn + F8 Turn screen expansion on or off. (There is no
symbol on the key.)
Fn + F9 Reserved.
Fn + F10 Reserved.
Fn + F11 Reserved.
Fn + F12 Turn hibernation mode on. To return to normal
operation, press the power button for less than
four seconds.
Fn + PgUp Turn the ThinkLight on or off.
Fn + Home The LCD becomes brighter.
Fn + End The LCD becomes less bright.
Product overview
46 ThinkPad T20, T21, T22, T23 (MT 2647/2648)
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