How to change default display output on ubuntu

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We use VGA output for default display on ubuntu,If you want to change it to HDMI you must to modify /etc/X11/xorg.conf, and modify device section as shown below.

Section "Device"
       Identifier      "i.MX Accelerated Framebuffer Device"
       Driver          "vivante"
       Option          "fbdev"         "/dev/fb2"
       Option          "vivante_fbdev" "/dev/fb2"
       Option          "HWcursor"      "false"
EndSection

Then restart lightdm to make this configure work.

sudo /etc/init.d/lightdm restart

PS,i.mx6's ubuntu is not yet support dual display ,you can see discus on freescale's community https://community.freescale.com/thread/311751

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