Fn Key Combinations - IBM ThinkPad X21 2660 Hardware Maintenance Manual

Memory 1. If two DIMMs are installed, remove
one of them and run Diagnostics
--> Memory Test - Quick.
2. If the problem does not recur,
replace the DIMM, remove the other
one, and run the test again.
3. If the test does not detect the error,
run Diagnostics --> Memory Test -
Full.
Fan 1. Turn on the computer and check the
air turbulence at the louver near the
power switch.
2. Run Diagnostics --> Other Devices
--> IBM Fan.

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 Combi-
nation Result
Fn + F1 Reserved.
Fn + F2 Reserved.
Fn + F3 Standby mode.
Fn + F4 Suspend mode.
Fn + F5 Reserved.
Fn + F6 Reserved.
Fn + F7 Switch between the LCD, the external
monitor, and both the LCD and external
monitor.
Fn + F8 Reserved.
Fn + F9 Reserved.
Fn + F12 Hibernation mode.
Fn + PgUp ThinkLight On/Off.
Fn + Home The LCD becomes brighter.
Fn + End The LCD becomes less bright.
37
ThinkPad X21