Yes, I have also this issue on Fujitsu E8420 BUT I have managed to get it
working and wanted to publish my solution here.
Im running ubuntu 11.10 and I have installed that additional driver #2, NVIDIA
accelerated graphics driver (post-release updates) (version 173-updates)
So This is what I did to get screen brightness buttons working:
I run "sudo nvidia-xconfig " to generate good xorg.conf file.
then I added this following line to there under device
"Option "RegistryDwords" "EnableBrightnessControl=1""
like this:
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
Option "RegistryDwords" "EnableBrightnessControl=1"
EndSection
And I hava my xorg.conf as an attachment:
** Attachment added: "Working copy of xorg.conf for Fujitsu E8420 with fn
screen brightnes"
https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers/+bug/562005/+attachment/2651761/+files/xorg.conf
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https://bugs.launchpad.net/bugs/562005
Title:
Backlight controls of laptops with NVIDIA NVS and Quadro FX 880M GPUs
no longer function while using proprietary drivers
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