Sony PCG-SRX87 - Manual (Page 82)

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4 Click the Intel® Graphics Technology tab, then click the Graphics Properties
button.
5 Click the Device tab.
6 Select the type of display.
Intel® 82815 Graphics Controller Properties Screen
✍
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.