Gary, thanks very much.
The asus-wmi driver maintainer did some modification on my patch
and we didn't imagine that will lead to the problem you have.

I totally know the situation and will try to figure out a feasible
solution for it.

The problem is that in your system, there are eeepc-wmi and acpi_video0 
directories in the /sys/class/backlight
and while pressing the hotkey, the gnome-settings-daemon will try to turn 
on/off the screen through /sys/class/backlight.
And in the gnome-settings-daemon, the one it chose to operate is acpi_video0 
which is not working.

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https://bugs.launchpad.net/bugs/1000146

Title:
  [ASUS X101CH and 1015CX] the hotkey to turn on/off the display is not
  working

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