Hi Jani.
If VGA attached on before power on:
only VGA has image. DP has backlight on, but no image.
xrandr list both displays.
After pressing Fn+F8, display switch button, both screens will work.
After this i get some warnings in dmesg.

If VGA attached after boot, both displays are working OK.

Now i able to test HDMI too. And there some issues as well. For example
it is not automatically detected after cable was attached.

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https://bugs.launchpad.net/bugs/946311

Title:
  only external screen is working with asus zenbook ux31e [eDP1]

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