Panasonic CF-T2 Series Reference Manual page 27

Using the Fn Key
Key
Fn+F1
LCD brightness control
(Fn+F1= down / Fn+F2= up)
Fn+F2
Pressing this key combination adjusts the LCD
brightness control.
You can select a different brightness level setting
for when the AC adaptor is connected and for when
it is not connected.
(At the time of purchase, the LCD brightness is set
to be darker when the AC adaptor is not
connected.)
Functions
27
Pop-up Window
(Displayed after
logging on to
Windows)