Sony PCG-SRX77 - Manual (Page 86)

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4 Click the Intel® Graphics Technology tab, then click the Graphics Properties
button. If you want to use the TV as a display, deselect the Synchronous
Display Mode box and click Apply. You cannot use the TV and another
display simultaneously.
5 Click the Device tab.
6 Select the type of display.
✍
You may not be able to display the notebook LCD screen and an external display or
projector at the same time, depending on the types of computer displays and
projectors you are using.
Turn on the notebook after you turn on the peripheral devices.