VIA Technologies VAB-820 - Setting Video Playback in Extension Mode

VAB-820 Linux BSP v3.2.0 Quick Start Guide
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5.2.3. Setting Video Playback in Extension Mode
There are four panel configurations supported in extension mode. Follow the
commands below for your desired set up.
Extension mode configuration 1:
To set this configuration, use the following command:
# xrandr –output HDMI --left-of LVDS
Extension mode configuration 2:
To set this configuration, use the following command:
# xrandr –output HDMI --right-of LVDS
Extension mode configuration 3:
To set this configuration, use the following command:
# xrandr –output HDMI --above LVDS