Acer ICONIA - Manual (Page 65)

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Adjusting display settings
It is important to have the correct display settings on your computer, otherwise
it may not work properly. If you connect an external display, the external
should always be set as the Primary Display.
Note: The <F5> key will change to when you press the
<Fn> key.
Important: The display settings should be adjusted using <Fn> +
< > or the Intel Graphics and Media Control Panel only.
If you have an external display device attached to the HDMI port or VGA port,
you can switch the upper display screen to the external device by pressing <Fn>
+ < > from Virtual Keyboard. If you have more than one device attached,
press the hotkey combination until it activates the desired device.
Using the Intel Graphics and Media Control Panel
To open the Intel Graphics and Media Control Panel, right-click on the icon
in the System Tray and select Graphics Properties... to open the Intel Graphics
and Media Control Panel.