Public bug reported:

Binary package hint: gnome-power-manager

When I try to change the brightness using hotkeys brightness jumps to a random 
value. Setting it through /proc/acpi or with xrandr works as expected. Relevant 
line from "xrandr --prop":
        BACKLIGHT_CONTROL:      kernel
                supported: native       legacy       combination  kernel      
        BACKLIGHT: 3 (0x00000003)       range:  (0,6)

Also  launching gnome-power-manager --verbose --no-daemon, pressing one
time brightness-down and then brightness-up produces the attached log

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

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Random reaction to brightness hotkeys
https://bugs.launchpad.net/bugs/376924
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