Hello, 
I don't want to start new bug but I've found similar problem on HP Pavilion 
notebook (dv2025nr, dv2000 series). After update (it might happened this week) 
brightness adjusting stopped working, I can't change it via FN+F7/F8 and 
applet. However, it can be adjusted via procfs, using file 
/proc/acpi/video/VGA/LCD/brightness (echo 60 > 
/proc/acpi/video/VGA/LCD/brightness as root).

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macbook brightness adjustment does not work in hardy
https://bugs.launchpad.net/bugs/206921
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