Public bug reported:

Binary package hint: gnome-power-manager

Gnome power manager will turn the screen black but fails to turn the
backlight off on my laptop LCD.  I suspect a bug in xset causing gnome-
power-manager to fail.

Example:
'xset dpms force off'
exhibits the same broken functionality (black screen instead of setting the 
lower power state of having the backlight off)

In contrast, 
'vbetool dpms off'
works as intended.

** Affects: gnome-power-manager (Ubuntu)
     Importance: Undecided
         Status: New

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xset fails to turn off LCD screen
https://bugs.launchpad.net/bugs/140644
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