Panasonic CF-T7 Series Reference Manual page 83

Troubleshooting (Advanced)
The display destination may be set to the external display.
Try changing the display destination by pressing Fn+F3.
If you want to switch the display destination repeatedly by pressing Fn+F3, make sure that the display destination has
switched completely each time before pressing Fn+F3 again.
The screen may become darker. Press Fn+F2 to make the screen brighter.
The screen remains dark, if the computer is resumed through either USB device, wired LAN or wireless LAN.
Press a key with no independent effect, such as Ctrl or Shift.
Do not use a key that may make a selection (Enter, Space, Esc, Y, N, numeric keys, and so on).
There is an afterimage
Display a different screen.
If the same screen is displayed for a long time, this may leave an afterimage.
The screen becomes disordered
The screen display may become distorted if the resolution or number of colors is changed, or if an external display is con-
nected or disconnected while the computer is operating. Restart the computer.
The display cannot be changed and the operation of the Touch Pad and the
touchscreen do not match the display angle
When some applications are running, the display may not be rotated and the operation of the Touch Pad and the touch-
screen may not match the display angle. Press the Ctrl + Alt + R key to rotate the display to the landscape mode. After
exiting the application, rotate the display, then start up the application again.
If the problem persists, restart the computer.
The LCD brightness changes a number of times when the AC adaptor is discon-
nected
Intel video driver power saving function (Intel® Display Power Saving Technology) (
changes the LCD brightness.
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