from a custom 2.6.30-rc8 kernel in Xorg.0.log:

(WW) NVIDIA(0): ACPI: Error: Unable to find the DOS (Enable/Disable output
(WW) NVIDIA(0):     switching) file path under /proc/acpi/video. The NVIDIA X
(WW) NVIDIA(0):     driver will not be able to respond to ACPI display change
(WW) NVIDIA(0):     hotkey events.

I have the lattest nvidia driver (185.18). In case it wasn't clear,
brightness doesn't work.

-- 
Cannot change brightness with 2.6.27-11+ kernel
https://bugs.launchpad.net/bugs/333386
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