Sony VAIO VPCZ12 SERIES - Manual (Page 118)

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Using Peripheral Devices >
Using the Multiple Monitors Function
To use the Multiple Monitors function
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The monitor port on your computer is not accessible when the computer is attached to the port replicator.
The screen resolution of your external display may change when you change the performance mode.
When you use the HDMI output port on your computer or the DVI-D port on the port replicator, select the SPEED or AUTO mode with the performance
selector switch. See Selecting Performance Modes (page 123) for mode selection.
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Your external display may not support the Multiple Monitors function.
Certain software applications may not be compatible with Multiple Monitors settings.
Make sure that your computer does not enter Sleep or Hibernate mode while you are using the Multiple Monitors function, or the computer may not
return to Normal mode.
If you set different colors on each display, do not expand a single window across two displays, or your software may not work properly.
1 Right-click on the desktop and select Screen resolution.
2 Click the drop-down list next to Multiple Displays, select Extend these displays, and then click OK.
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You can set the display colors and resolution for each display and customize the Multiple Monitors function.
Set fewer colors or a lower resolution for each display.