Sony PCG-GRS100 - Manual (Page 69)

Playing DVDs
69
How do I switch the computer screen (LCD) from LCD to TV?
Press Fn+F8 to select either the computer or TV display. See “Selecting a display
mode” for more information.
The Fn+F8 key combination will not work once a DVD is inserted into the
optical drive. Switching the display while a DVD is playing may cause the
computer to malfunction, and you may need to restart the DVD software.