*** This bug is a duplicate of bug 765438 ***
    https://bugs.launchpad.net/bugs/765438

This bug is unlike the others currently set as duplicates here:
The backlight does come back on by itself.
It is an Asus hardware while the others are Acers.
May also be the only KDE system.

Could you please check:

If you try on a terminal window:
sudo setpci -s 00:02.0 F4.B=10
does it affect the brightness? Is the backlight now rather dark or rather 
bright?

The same with 
sudo setpci -s 00:02.0 F4.B=EE

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https://bugs.launchpad.net/bugs/775961

Title:
  11.04. No backlight at boot time (turns on on KDE startup)

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