This is a bug concerning all linux distributions not only ubuntu.
Probably a driver problem. But as asus hasn't released any details on
how the chip set works switching its hard to say whats going on.
I can confirm that this bug exists on all version of ubuntu from 12.04
and up (i have tested them all)
Setting the different backlight options only controls the light in the
keyboard or the internal display but not the external display.
Perhaps it is some kind of display switch needed in the lines of
optimus. I will investigate this later this week. Please keep this bug
open.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1205694
Title:
8086:0166 [Taichi 21] external screen is not working properly
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