Public bug reported:

Binary package hint: gnome-power-manager

Running Gutsy/x86/Lenovo t60 Thinkpad.

Any attempt to change monitor brightness fails. The fn-home/fn-end
keystrokes do not work, nor does gnome-power-manager change it. In fact,
gnome shows the brightness to be at 100%, while
/proc/acpi/ibm/brightness is at 0. Altering the brightness file in
terminal does not affect it--the file simply reverts back to 0.

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

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unable to change monitor brightness
https://bugs.launchpad.net/bugs/147233
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