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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. The operating system obtains the status through
the system management interface to control the system.
Fn + Description
F1 Reserved.
F2 Turn the Fuel Gauge display on or
off.
F3 Turn standby mode on.
F4 Turn suspend mode on.
F5 Reserved.
F6 Reserved.
F7 Switch between the LCD and an
external monitor.
F8 Turn screen expansion on or off.
(There is no symbol on the key.)
F9 Reserved.
F10 Reserved.
F11 Switch the power management
mode:
high performance, automatic, or
customized.
Note: In Windows 98, only the
CPU speed is changed.
F12 Turn hibernation mode on.
Pg Up Increase the volume, or unmute.
Pg Dn Decrease the volume, or unmute.
Backspace Mute.
Note: To turn on the sound,
press Fn + PgUp or Fn + PgDn.
16 ThinkPad 600X Hardware Maintenance Manual