Fn Key Combinations - IBM ThinkPad X20 Hardware Maintenance Manual

Memory
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 Combination
Fn + F1
Fn + F2
Fn + F3
Fn + F4
Fn + F5
Fn + F6
Fn + F7
Fn + F8
Fn + F9
Fn + F12
Fn + PgUp
Fn + Home
Fn + End
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ThinkPad X20, X21, X22, X23
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.
1. Turn on the computer and check the air
turbulence at the louver near the power
switch.
2. Run Diagnostics --> Other Devices -->
IBM Fan.
Result
Reserved.
Reserved.
Standby mode.
Suspend mode.
Reserved.
Reserved.
Switch between the LCD, the external
monitor, and both the LCD and external
monitor.
Reserved.
Reserved.
Hibernation mode.
ThinkLight On/Off.
The LCD becomes brighter.
The LCD becomes less bright.