Fn
key
combinations
The
following
table
shows
the
function
of
each
combination
of
Fn
with
a
function
key.
Key
combination
Description
Fn+F1
Reserved.
Fn+F2
Reserved.
Fn+F3
Standby
mode
Turn
off
the
LCD
display,
leaving
the
screen
blank.
Hard
disk
drive
spindown
while
CPU
still
works.
To
turn
the
LCD
display
on
again,
press
any
key
or
the
TrackPoint
stick.
Fn+F4
Sleep
mode
This
function
causes
the
system
to
enter
a
low
power
sleep
state.
The
unit
may
remain
in
the
Sleep
state
for
an
extended
time.
For
ACPI
systems
the
OS
will
determine
which
state
the
system
will
enter
by
user
setting
on
the
control
panel.
Fn+F5
Wireless
radio
on/off
switching
Enable
or
disable
the
built-in
wireless
networking
features
(
the
IEEE
802.11
standard)
and
the
Bluetooth
features.
If
this
combination
of
keys
are
pressed,
a
list
of
wireless
features
is
displayed
in
the
Wireless
Radio
Control
window.
The
user
can
quickly
change
the
power
state
of
each
feature
in
the
list.
(continued)
Product
overview
54
ThinkPad
X40
(2369,
2370,
2371,
2372,
2382,
2386)
