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[Bungeur <sanfton-0801@xxxxxxxxxxx>]

Got same bug, or at least closely related. nvidia GT216 [GeForce GT240M] does not respond to brightness commands. 
This laptop is a new Fujitsu Amilo Pi 3560. The keys are Fn-F8(down); Fn-F9(up).

Attached Xorg.0.log shows events:

(II) May 10 20:29:32 NVIDIA(0): Setting mode
(II) May 10 20:29:32 NVIDIA(0):     "CRT:nvidia-auto-select+0+0,DFP:nvidia-auto-select+0+0"
(II) May 10 20:29:33 NVIDIA(0): ACPI display change hotkey events enabled: the X server is new
(II) May 10 20:29:33 NVIDIA(0):     enough to receive ACPI hotkey events.
(WW) May 10 20:29:33 NVIDIA(0): ACPI: Error: Unable to find the brightness file path under
(WW) May 10 20:29:33 NVIDIA(0):     /proc/acpi/video. The NVIDIA X driver will not be able to
(WW) May 10 20:29:33 NVIDIA(0):     respond to ACPI brightness change hotkey events.


** Attachment added: "Xorg.0.log"
   http://launchpadlibrarian.net/48239078/Xorg.0.log

-- 
Fn+F5 and Fn+F6 don't modify brightness on Sony VAIO VPCCW (GT 230M)
https://bugs.launchpad.net/bugs/551668
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